31489679593 has 2 divisors, whose sum is σ = 31489679594. Its totient is φ = 31489679592.

The previous prime is 31489679567. The next prime is 31489679623. The reversal of 31489679593 is 39597698413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25145079184 + 6344600409 = 158572^2 + 79653^2 .

It is a cyclic number.

It is not a de Polignac number, because 31489679593 - 2⁵ = 31489679561 is a prime.

It is not a weakly prime, because it can be changed into another prime (31489679563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15744839796 + 15744839797.

It is an arithmetic number, because the mean of its divisors is an integer number (15744839797).

Almost surely, 2^31489679593 is an apocalyptic number.

It is an amenable number.

31489679593 is a deficient number, since it is larger than the sum of its proper divisors (1).

31489679593 is an equidigital number, since it uses as much as digits as its factorization.

31489679593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44089920, while the sum is 64.

The spelling of 31489679593 in words is "thirty-one billion, four hundred eighty-nine million, six hundred seventy-nine thousand, five hundred ninety-three".