31690197 has 40 divisors (see below), whose sum is σ = 59032512. Its totient is φ = 16459200.

The previous prime is 31690189. The next prime is 31690199. The reversal of 31690197 is 79109613.

It is not a de Polignac number, because 31690197 - 2³ = 31690189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31690199) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3697 + ... + 8777.

Almost surely, 2^31690197 is an apocalyptic number.

It is an amenable number.

31690197 is a deficient number, since it is larger than the sum of its proper divisors (27342315).

31690197 is a wasteful number, since it uses less digits than its factorization.

31690197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111 (or 5102 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 31690197 is about 5629.4046754519. The cubic root of 31690197 is about 316.4523411539.

The spelling of 31690197 in words is "thirty-one million, six hundred ninety thousand, one hundred ninety-seven".