31231122013 has 24 divisors (see below), whose sum is σ = 39161435040. Its totient is φ = 24687139680.

The previous prime is 31231122001. The next prime is 31231122029. The reversal of 31231122013 is 31022113213.

It is not a de Polignac number, because 31231122013 - 2⁵ = 31231121981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231122053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672498 + ... + 717436.

It is an arithmetic number, because the mean of its divisors is an integer number (1631726460).

Almost surely, 2^31231122013 is an apocalyptic number.

It is an amenable number.

31231122013 is a deficient number, since it is larger than the sum of its proper divisors (7930313027).

31231122013 is a wasteful number, since it uses less digits than its factorization.

31231122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46057 (or 46050 counting only the distinct ones).

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

Adding to 31231122013 its reverse (31022113213), we get a palindrome (62253235226).

The spelling of 31231122013 in words is "thirty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, thirteen".