31331231313 has 4 divisors (see below), whose sum is σ = 41774975088. Its totient is φ = 20887487540.

The previous prime is 31331231263. The next prime is 31331231329. The reversal of 31331231313 is 31313213313.

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 cyclic number.

It is not a de Polignac number, because 31331231313 - 2¹⁰ = 31331230289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31331231333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5221871883 + ... + 5221871888.

It is an arithmetic number, because the mean of its divisors is an integer number (10443743772).

Almost surely, 2^31331231313 is an apocalyptic number.

It is an amenable number.

31331231313 is a deficient number, since it is larger than the sum of its proper divisors (10443743775).

31331231313 is a wasteful number, since it uses less digits than its factorization.

31331231313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10443743774.

The product of its digits is 1458, while the sum is 24.

Adding to 31331231313 its reverse (31313213313), we get a palindrome (62644444626).

The spelling of 31331231313 in words is "thirty-one billion, three hundred thirty-one million, two hundred thirty-one thousand, three hundred thirteen".