31608091 has 2 divisors, whose sum is σ = 31608092. Its totient is φ = 31608090.

The previous prime is 31608067. The next prime is 31608107. The reversal of 31608091 is 19080613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31608091 - 2⁹ = 31607579 is a prime.

It is not a weakly prime, because it can be changed into another prime (31608041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15804045 + 15804046.

It is an arithmetic number, because the mean of its divisors is an integer number (15804046).

Almost surely, 2^31608091 is an apocalyptic number.

31608091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31608091 is an equidigital number, since it uses as much as digits as its factorization.

31608091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 31608091 is about 5622.1073451154. The cubic root of 31608091 is about 316.1788064315.

The spelling of 31608091 in words is "thirty-one million, six hundred eight thousand, ninety-one".