31317079 has 2 divisors, whose sum is σ = 31317080. Its totient is φ = 31317078.

The previous prime is 31317049. The next prime is 31317089. The reversal of 31317079 is 97071313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31317079 - 2¹³ = 31308887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31317079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31317049) 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 as a sum of consecutive naturals, namely, 15658539 + 15658540.

It is an arithmetic number, because the mean of its divisors is an integer number (15658540).

Almost surely, 2^31317079 is an apocalyptic number.

31317079 is a deficient number, since it is larger than the sum of its proper divisors (1).

31317079 is an equidigital number, since it uses as much as digits as its factorization.

31317079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 31317079 is about 5596.1664557088. The cubic root of 31317079 is about 315.2054727281.

The spelling of 31317079 in words is "thirty-one million, three hundred seventeen thousand, seventy-nine".