161435928931 has 2 divisors, whose sum is σ = 161435928932. Its totient is φ = 161435928930.

The previous prime is 161435928923. The next prime is 161435928949. The reversal of 161435928931 is 139829534161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161435928931 - 2³ = 161435928923 is a prime.

It is a super-2 number, since 2×161435928931² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161435928971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80717964465 + 80717964466.

It is an arithmetic number, because the mean of its divisors is an integer number (80717964466).

Almost surely, 2^161435928931 is an apocalyptic number.

161435928931 is a deficient number, since it is larger than the sum of its proper divisors (1).

161435928931 is an equidigital number, since it uses as much as digits as its factorization.

161435928931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 52.

The spelling of 161435928931 in words is "one hundred sixty-one billion, four hundred thirty-five million, nine hundred twenty-eight thousand, nine hundred thirty-one".