31200312013 has 4 divisors (see below), whose sum is σ = 33600336028. Its totient is φ = 28800288000.

The previous prime is 31200311981. The next prime is 31200312023. The reversal of 31200312013 is 31021300213.

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 16237640329 + 14962671684 = 127427^2 + 122322^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200312013 - 2⁵ = 31200311981 is a prime.

It is a super-2 number, since 2×31200312013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200312023) 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, 1200011988 + ... + 1200012013.

It is an arithmetic number, because the mean of its divisors is an integer number (8400084007).

Almost surely, 2^31200312013 is an apocalyptic number.

It is an amenable number.

31200312013 is a deficient number, since it is larger than the sum of its proper divisors (2400024015).

31200312013 is a wasteful number, since it uses less digits than its factorization.

31200312013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400024014.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31200312013 its reverse (31021300213), we get a palindrome (62221612226).

The spelling of 31200312013 in words is "thirty-one billion, two hundred million, three hundred twelve thousand, thirteen".