31225711161 has 4 divisors (see below), whose sum is σ = 41634281552. Its totient is φ = 20817140772.

The previous prime is 31225711159. The next prime is 31225711183. The reversal of 31225711161 is 16111752213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16111752213 = 3 ⋅5370584071.

It is not a de Polignac number, because 31225711161 - 2¹ = 31225711159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31225731161) 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, 5204285191 + ... + 5204285196.

It is an arithmetic number, because the mean of its divisors is an integer number (10408570388).

Almost surely, 2^31225711161 is an apocalyptic number.

It is an amenable number.

31225711161 is a deficient number, since it is larger than the sum of its proper divisors (10408570391).

31225711161 is a wasteful number, since it uses less digits than its factorization.

31225711161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10408570390.

The product of its digits is 2520, while the sum is 30.

The spelling of 31225711161 in words is "thirty-one billion, two hundred twenty-five million, seven hundred eleven thousand, one hundred sixty-one".