31306108161 has 16 divisors (see below), whose sum is σ = 42950856960. Its totient is φ = 20271473040.

The previous prime is 31306108139. The next prime is 31306108187. The reversal of 31306108161 is 16180160313.

It is not a de Polignac number, because 31306108161 - 2⁷ = 31306108033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31306103161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 654795 + ... + 700976.

It is an arithmetic number, because the mean of its divisors is an integer number (2684428560).

Almost surely, 2^31306108161 is an apocalyptic number.

It is an amenable number.

31306108161 is a deficient number, since it is larger than the sum of its proper divisors (11644748799).

31306108161 is a wasteful number, since it uses less digits than its factorization.

31306108161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355996.

The product of its (nonzero) digits is 2592, while the sum is 30.

Adding to 31306108161 its reverse (16180160313), we get a palindrome (47486268474).

The spelling of 31306108161 in words is "thirty-one billion, three hundred six million, one hundred eight thousand, one hundred sixty-one".