31231022113 has 4 divisors (see below), whose sum is σ = 32307953940. Its totient is φ = 30154090288.

The previous prime is 31231022089. The next prime is 31231022161. The reversal of 31231022113 is 31122013213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5173637184 + 26057384929 = 71928^2 + 161423^2 .

It is a cyclic number.

It is not a de Polignac number, because 31231022113 - 2²⁵ = 31197467681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231122113) 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, 538465870 + ... + 538465927.

It is an arithmetic number, because the mean of its divisors is an integer number (8076988485).

Almost surely, 2^31231022113 is an apocalyptic number.

It is an amenable number.

31231022113 is a deficient number, since it is larger than the sum of its proper divisors (1076931827).

31231022113 is a wasteful number, since it uses less digits than its factorization.

31231022113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076931826.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31231022113 its reverse (31122013213), we get a palindrome (62353035326).

The spelling of 31231022113 in words is "thirty-one billion, two hundred thirty-one million, twenty-two thousand, one hundred thirteen".