31317089 has 2 divisors, whose sum is σ = 31317090. Its totient is φ = 31317088.

The previous prime is 31317079. The next prime is 31317103. The reversal of 31317089 is 98071313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30250000 + 1067089 = 5500^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 31317089 - 2⁸ = 31316833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31317049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15658544 + 15658545.

It is an arithmetic number, because the mean of its divisors is an integer number (15658545).

Almost surely, 2^31317089 is an apocalyptic number.

It is an amenable number.

31317089 is a deficient number, since it is larger than the sum of its proper divisors (1).

31317089 is an equidigital number, since it uses as much as digits as its factorization.

31317089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 31317089 is about 5596.1673491775. The cubic root of 31317089 is about 315.2055062780.

The spelling of 31317089 in words is "thirty-one million, three hundred seventeen thousand, eighty-nine".