31670091 has 6 divisors (see below), whose sum is σ = 45745700. Its totient is φ = 21113388.

The previous prime is 31670087. The next prime is 31670123. The reversal of 31670091 is 19007613.

It is not a de Polignac number, because 31670091 - 2² = 31670087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31670021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1759441 + ... + 1759458.

Almost surely, 2^31670091 is an apocalyptic number.

31670091 is a deficient number, since it is larger than the sum of its proper divisors (14075609).

31670091 is a wasteful number, since it uses less digits than its factorization.

31670091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518905 (or 3518902 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 31670091 is about 5627.6185904875. The cubic root of 31670091 is about 316.3854020850.

It can be divided in two parts, 316 and 70091, that added together give a palindrome (70407).

The spelling of 31670091 in words is "thirty-one million, six hundred seventy thousand, ninety-one".