31690927 has 4 divisors (see below), whose sum is σ = 31814496. Its totient is φ = 31567360.

The previous prime is 31690913. The next prime is 31690931. The reversal of 31690927 is 72909613.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31690927 - 2²³ = 23302319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31690027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61399 + ... + 61912.

It is an arithmetic number, because the mean of its divisors is an integer number (7953624).

Almost surely, 2^31690927 is an apocalyptic number.

31690927 is a deficient number, since it is larger than the sum of its proper divisors (123569).

31690927 is a wasteful number, since it uses less digits than its factorization.

31690927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123568.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 31690927 is about 5629.4695131957. The cubic root of 31690927 is about 316.4547710160.

The spelling of 31690927 in words is "thirty-one million, six hundred ninety thousand, nine hundred twenty-seven".