31032012313 has 4 divisors (see below), whose sum is σ = 32857424820. Its totient is φ = 29206599808.

The previous prime is 31032012299. The next prime is 31032012317. The reversal of 31032012313 is 31321023013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28592442649 + 2439569664 = 169093^2 + 49392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31032012313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31032012317) 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, 912706228 + ... + 912706261.

It is an arithmetic number, because the mean of its divisors is an integer number (8214356205).

Almost surely, 2^31032012313 is an apocalyptic number.

It is an amenable number.

31032012313 is a deficient number, since it is larger than the sum of its proper divisors (1825412507).

31032012313 is a wasteful number, since it uses less digits than its factorization.

31032012313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825412506.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31032012313 its reverse (31321023013), we get a palindrome (62353035326).

The spelling of 31032012313 in words is "thirty-one billion, thirty-two million, twelve thousand, three hundred thirteen".