161131466356231 has 4 divisors (see below), whose sum is σ = 184150247264272. Its totient is φ = 138112685448192.

The previous prime is 161131466356177. The next prime is 161131466356261. The reversal of 161131466356231 is 132653664131161.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-161131466356231 is a prime.

It is a super-2 number, since 2×161131466356231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161131466356261) 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, 11509390454010 + ... + 11509390454023.

It is an arithmetic number, because the mean of its divisors is an integer number (46037561816068).

Almost surely, 2^{161131466356231} is an apocalyptic number.

161131466356231 is a deficient number, since it is larger than the sum of its proper divisors (23018780908041).

161131466356231 is an equidigital number, since it uses as much as digits as its factorization.

161131466356231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23018780908040.

The product of its digits is 1399680, while the sum is 49.

The spelling of 161131466356231 in words is "one hundred sixty-one trillion, one hundred thirty-one billion, four hundred sixty-six million, three hundred fifty-six thousand, two hundred thirty-one".