31690139 has 16 divisors (see below), whose sum is σ = 35212800. Its totient is φ = 28338336.

The previous prime is 31690133. The next prime is 31690151. The reversal of 31690139 is 93109613.

It is not a de Polignac number, because 31690139 - 2⁴ = 31690123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31690133) 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, 60332 + ... + 60854.

It is an arithmetic number, because the mean of its divisors is an integer number (2200800).

Almost surely, 2^31690139 is an apocalyptic number.

31690139 is a deficient number, since it is larger than the sum of its proper divisors (3522661).

31690139 is a wasteful number, since it uses less digits than its factorization.

31690139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 31690139 is about 5629.3995239279. The cubic root of 31690139 is about 316.4521480947.

The spelling of 31690139 in words is "thirty-one million, six hundred ninety thousand, one hundred thirty-nine".