31203113213 has 4 divisors (see below), whose sum is σ = 31207002720. Its totient is φ = 31199223708.

The previous prime is 31203113197. The next prime is 31203113219. The reversal of 31203113213 is 31231130213.

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 31203113213 - 2⁴ = 31203113197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203113219) 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, 1932695 + ... + 1948772.

It is an arithmetic number, because the mean of its divisors is an integer number (7801750680).

Almost surely, 2^31203113213 is an apocalyptic number.

It is an amenable number.

31203113213 is a deficient number, since it is larger than the sum of its proper divisors (3889507).

31203113213 is an equidigital number, since it uses as much as digits as its factorization.

31203113213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3889506.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31203113213 its reverse (31231130213), we get a palindrome (62434243426).

The spelling of 31203113213 in words is "thirty-one billion, two hundred three million, one hundred thirteen thousand, two hundred thirteen".