| Base | Representation |
|---|---|
| bin | 10110110110001… |
| … | …01000110100001 |
| 3 | 111100121201212001 |
| 4 | 23123011012201 |
| 5 | 343030220121 |
| 6 | 31003404001 |
| 7 | 4514660665 |
| oct | 1333050641 |
| 9 | 440551761 |
| 10 | 191648161 |
| 11 | 991a9111 |
| 12 | 54223601 |
| 13 | 309219a3 |
| 14 | 1b64a8a5 |
| 15 | 11c59991 |
| hex | b6c51a1 |
191648161 has 4 divisors (see below), whose sum is σ = 191680132. Its totient is φ = 191616192.
The previous prime is 191648131. The next prime is 191648183. The reversal of 191648161 is 161846191.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161846191 = 13 ⋅12449707.
It can be written as a sum of positive squares in 2 ways, for example, as 45697600 + 145950561 = 6760^2 + 12081^2 .
It is a 3-Lehmer number, since φ(191648161) divides (191648161-1)3.
It is a cyclic number.
It is not a de Polignac number, because 191648161 - 25 = 191648129 is a prime.
It is a super-2 number, since 2×1916481612 = 73458035229363842, which contains 22 as substring.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 191648161.
It is not an unprimeable number, because it can be changed into a prime (191648111) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3996 + ... + 19981.
It is an arithmetic number, because the mean of its divisors is an integer number (47920033).
It is a Poulet number, since it divides 2191648160-1.
Almost surely, 2191648161 is an apocalyptic number.
191648161 is the 7993-rd octagonal number.
It is an amenable number.
191648161 is a deficient number, since it is larger than the sum of its proper divisors (31971).
191648161 is an equidigital number, since it uses as much as digits as its factorization.
191648161 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 31970.
The product of its digits is 10368, while the sum is 37.
The square root of 191648161 is about 13843.7047425897. The cubic root of 191648161 is about 576.5472240100.
The spelling of 191648161 in words is "one hundred ninety-one million, six hundred forty-eight thousand, one hundred sixty-one".
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