31313631313 has 4 divisors (see below), whose sum is σ = 32675093568. Its totient is φ = 29952169060.

The previous prime is 31313631299. The next prime is 31313631373.

It is a happy number.

31313631313 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 31313631313 - 2²¹ = 31311534161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313631373) 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, 680731093 + ... + 680731138.

It is an arithmetic number, because the mean of its divisors is an integer number (8168773392).

Almost surely, 2^31313631313 is an apocalyptic number.

It is an amenable number.

31313631313 is a deficient number, since it is larger than the sum of its proper divisors (1361462255).

31313631313 is a wasteful number, since it uses less digits than its factorization.

31313631313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361462254.

The product of its digits is 4374, while the sum is 28.

The spelling of 31313631313 in words is "thirty-one billion, three hundred thirteen million, six hundred thirty-one thousand, three hundred thirteen".