161063931 has 24 divisors (see below), whose sum is σ = 262966080. Its totient is φ = 87190992.

The previous prime is 161063891. The next prime is 161063957. The reversal of 161063931 is 139360161.

It is not a de Polignac number, because 161063931 - 2¹⁵ = 161031163 is a prime.

It is a super-2 number, since 2×161063931² = 51883179738345522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161063431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26041 + ... + 31626.

It is an arithmetic number, because the mean of its divisors is an integer number (10956920).

Almost surely, 2^161063931 is an apocalyptic number.

161063931 is a deficient number, since it is larger than the sum of its proper divisors (101902149).

161063931 is a wasteful number, since it uses less digits than its factorization.

161063931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57703 (or 57696 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 161063931 is about 12691.0965247295. The cubic root of 161063931 is about 544.0841797266.

The spelling of 161063931 in words is "one hundred sixty-one million, sixty-three thousand, nine hundred thirty-one".