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161156401 = 723022343
BaseRepresentation
bin10011001101100…
…00110100110001
3102020020121000121
421212300310301
5312224001101
623554050241
73664543510
oct1146606461
9366217017
10161156401
1182a7220a
1245b79981
1327506c23
1417590677
15e2350a1
hex99b0d31

161156401 has 4 divisors (see below), whose sum is σ = 184178752. Its totient is φ = 138134052.

The previous prime is 161156399. The next prime is 161156407. The reversal of 161156401 is 104651161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161156401 - 21 = 161156399 is a prime.

It is a super-5 number, since 5×1611564015 (a number of 42 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161156407) 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, 11511165 + ... + 11511178.

It is an arithmetic number, because the mean of its divisors is an integer number (46044688).

Almost surely, 2161156401 is an apocalyptic number.

It is an amenable number.

161156401 is a deficient number, since it is larger than the sum of its proper divisors (23022351).

161156401 is an equidigital number, since it uses as much as digits as its factorization.

161156401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23022350.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 161156401 is about 12694.7391072050. The cubic root of 161156401 is about 544.1882829825.

The spelling of 161156401 in words is "one hundred sixty-one million, one hundred fifty-six thousand, four hundred one".

Divisors: 1 7 23022343 161156401