31690899 has 16 divisors (see below), whose sum is σ = 47127840. Its totient is φ = 21047040.

The previous prime is 31690889. The next prime is 31690913. The reversal of 31690899 is 99809613.

It is a de Polignac number, because none of the positive numbers 2^k-31690899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31690859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5499 + ... + 9675.

It is an arithmetic number, because the mean of its divisors is an integer number (2945490).

Almost surely, 2^31690899 is an apocalyptic number.

31690899 is a deficient number, since it is larger than the sum of its proper divisors (15436941).

31690899 is a wasteful number, since it uses less digits than its factorization.

31690899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4467 (or 4461 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 31690899 is about 5629.4670262823. The cubic root of 31690899 is about 316.4546778165.

The spelling of 31690899 in words is "thirty-one million, six hundred ninety thousand, eight hundred ninety-nine".