31311031313 has 4 divisors (see below), whose sum is σ = 31430084928. Its totient is φ = 31191977700.

The previous prime is 31311031267. The next prime is 31311031319. The reversal of 31311031313 is 31313011313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31313011313 = 19 ⋅1648053227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31311031313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311031319) 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, 59526413 + ... + 59526938.

It is an arithmetic number, because the mean of its divisors is an integer number (7857521232).

Almost surely, 2^31311031313 is an apocalyptic number.

It is an amenable number.

31311031313 is a deficient number, since it is larger than the sum of its proper divisors (119053615).

31311031313 is a wasteful number, since it uses less digits than its factorization.

31311031313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119053614.

The product of its (nonzero) digits is 243, while the sum is 20.

Adding to 31311031313 its reverse (31313011313), we get a palindrome (62624042626).

The spelling of 31311031313 in words is "thirty-one billion, three hundred eleven million, thirty-one thousand, three hundred thirteen".