31213899 has 12 divisors (see below), whose sum is σ = 45136000. Its totient is φ = 20786544.

The previous prime is 31213879. The next prime is 31213901. The reversal of 31213899 is 99831213.

Together with 13922100 it forms a betrothed pair.

It is not a de Polignac number, because 31213899 - 2⁵ = 31213867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12822 + ... + 15060.

Almost surely, 2^31213899 is an apocalyptic number.

31213899 is a deficient number, since it is larger than the sum of its proper divisors (13922101).

31213899 is a wasteful number, since it uses less digits than its factorization.

31213899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794 (or 3791 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 31213899 is about 5586.9400390554. The cubic root of 31213899 is about 314.8589239775.

The spelling of 31213899 in words is "thirty-one million, two hundred thirteen thousand, eight hundred ninety-nine".