31331001231313 has 4 divisors (see below), whose sum is σ = 35806858550080. Its totient is φ = 26855143912548.

The previous prime is 31331001231307. The next prime is 31331001231323. The reversal of 31331001231313 is 31313210013313.

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.

It is a de Polignac number, because none of the positive numbers 2^k-31331001231313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31331001231323) 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, 2237928659373 + ... + 2237928659386.

It is an arithmetic number, because the mean of its divisors is an integer number (8951714637520).

Almost surely, 2^{31331001231313} is an apocalyptic number.

It is an amenable number.

31331001231313 is a deficient number, since it is larger than the sum of its proper divisors (4475857318767).

31331001231313 is an equidigital number, since it uses as much as digits as its factorization.

31331001231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4475857318766.

The product of its (nonzero) digits is 1458, while the sum is 25.

Adding to 31331001231313 its reverse (31313210013313), we get a palindrome (62644211244626).

The spelling of 31331001231313 in words is "thirty-one trillion, three hundred thirty-one billion, one million, two hundred thirty-one thousand, three hundred thirteen".