31906491 has 16 divisors (see below), whose sum is σ = 45133440. Its totient is φ = 19992960.

The previous prime is 31906429. The next prime is 31906507. The reversal of 31906491 is 19460913.

It is not a de Polignac number, because 31906491 - 2⁷ = 31906363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31906421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5331 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (2820840).

Almost surely, 2^31906491 is an apocalyptic number.

31906491 is a deficient number, since it is larger than the sum of its proper divisors (13226949).

31906491 is a wasteful number, since it uses less digits than its factorization.

31906491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 31906491 is about 5648.5830966712. The cubic root of 31906491 is about 317.1706664253.

The spelling of 31906491 in words is "thirty-one million, nine hundred six thousand, four hundred ninety-one".