31999299913 has 6 divisors (see below), whose sum is σ = 37223675466. Its totient is φ = 27427971312.

The previous prime is 31999299887. The next prime is 31999299947.

31999299913 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 18335326464 + 13663973449 = 135408^2 + 116893^2 .

It is not a de Polignac number, because 31999299913 - 2¹⁷ = 31999168841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (34999299913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 326523420 + ... + 326523517.

It is an arithmetic number, because the mean of its divisors is an integer number (6203945911).

Almost surely, 2^31999299913 is an apocalyptic number.

It is an amenable number.

31999299913 is a deficient number, since it is larger than the sum of its proper divisors (5224375553).

31999299913 is an equidigital number, since it uses as much as digits as its factorization.

31999299913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653046951 (or 653046944 counting only the distinct ones).

The product of its digits is 9565938, while the sum is 64.

The spelling of 31999299913 in words is "thirty-one billion, nine hundred ninety-nine million, two hundred ninety-nine thousand, nine hundred thirteen".