31131341313 has 4 divisors (see below), whose sum is σ = 41508455088. Its totient is φ = 20754227540.

The previous prime is 31131341309. The next prime is 31131341321. The reversal of 31131341313 is 31314313113.

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 31131341313 - 2² = 31131341309 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31131341303) 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, 5188556883 + ... + 5188556888.

It is an arithmetic number, because the mean of its divisors is an integer number (10377113772).

Almost surely, 2^31131341313 is an apocalyptic number.

It is an amenable number.

31131341313 is a deficient number, since it is larger than the sum of its proper divisors (10377113775).

31131341313 is a wasteful number, since it uses less digits than its factorization.

31131341313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10377113774.

The product of its digits is 972, while the sum is 24.

Adding to 31131341313 its reverse (31314313113), we get a palindrome (62445654426).

The spelling of 31131341313 in words is "thirty-one billion, one hundred thirty-one million, three hundred forty-one thousand, three hundred thirteen".