161240931 has 12 divisors (see below), whose sum is σ = 239198752. Its totient is φ = 104588496.

The previous prime is 161240921. The next prime is 161240939. The reversal of 161240931 is 139042161.

161240931 is a `hidden beast` number, since 1 + 612 + 40 + 9 + 3 + 1 = 666.

It is not a de Polignac number, because 161240931 - 2¹⁰ = 161239907 is a prime.

It is a super-2 number, since 2×161240931² = 51997275659493522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161240895 and 161240904.

It is not an unprimeable number, because it can be changed into a prime (161240939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241771 + ... + 242436.

Almost surely, 2^161240931 is an apocalyptic number.

161240931 is a deficient number, since it is larger than the sum of its proper divisors (77957821).

161240931 is a wasteful number, since it uses less digits than its factorization.

161240931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484250 (or 484247 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161240931 is about 12698.0680026530. The cubic root of 161240931 is about 544.2834125066.

The spelling of 161240931 in words is "one hundred sixty-one million, two hundred forty thousand, nine hundred thirty-one".