31890667 has 2 divisors, whose sum is σ = 31890668. Its totient is φ = 31890666.

The previous prime is 31890659. The next prime is 31890679. The reversal of 31890667 is 76609813.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31890667 - 2³ = 31890659 is a prime.

It is a Chen prime.

It is equal to p_1967485 and since 31890667 and 1967485 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31890637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15945333 + 15945334.

It is an arithmetic number, because the mean of its divisors is an integer number (15945334).

Almost surely, 2^31890667 is an apocalyptic number.

31890667 is a deficient number, since it is larger than the sum of its proper divisors (1).

31890667 is an equidigital number, since it uses as much as digits as its factorization.

31890667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 31890667 is about 5647.1822177082. The cubic root of 31890667 is about 317.1182242376.

The spelling of 31890667 in words is "thirty-one million, eight hundred ninety thousand, six hundred sixty-seven".