161130612931 has 4 divisors (see below), whose sum is σ = 161144494792. Its totient is φ = 161116731072.

The previous prime is 161130612889. The next prime is 161130612959. The reversal of 161130612931 is 139216031161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 139216031161 = 7481 ⋅18609281.

It is a cyclic number.

It is not a de Polignac number, because 161130612931 - 2⁷ = 161130612803 is a prime.

It is a super-2 number, since 2×161130612931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161130612971) 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, 6923505 + ... + 6946738.

It is an arithmetic number, because the mean of its divisors is an integer number (40286123698).

Almost surely, 2^161130612931 is an apocalyptic number.

161130612931 is a deficient number, since it is larger than the sum of its proper divisors (13881861).

161130612931 is a wasteful number, since it uses less digits than its factorization.

161130612931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13881860.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 161130612931 in words is "one hundred sixty-one billion, one hundred thirty million, six hundred twelve thousand, nine hundred thirty-one".