161654971 has 4 divisors (see below), whose sum is σ = 168683472. Its totient is φ = 154626472.

The previous prime is 161654963. The next prime is 161655007. The reversal of 161654971 is 179456161.

161654971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179456161 = 257 ⋅698273.

It is a cyclic number.

It is not a de Polignac number, because 161654971 - 2³ = 161654963 is a prime.

It is a super-2 number, since 2×161654971² = 52264659298021682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161654371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3514216 + ... + 3514261.

It is an arithmetic number, because the mean of its divisors is an integer number (42170868).

Almost surely, 2^161654971 is an apocalyptic number.

161654971 is a deficient number, since it is larger than the sum of its proper divisors (7028501).

161654971 is an equidigital number, since it uses as much as digits as its factorization.

161654971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7028500.

The product of its digits is 45360, while the sum is 40.

The square root of 161654971 is about 12714.3608175952. The cubic root of 161654971 is about 544.7488908561.

The spelling of 161654971 in words is "one hundred sixty-one million, six hundred fifty-four thousand, nine hundred seventy-one".