31517005189 has 2 divisors, whose sum is σ = 31517005190. Its totient is φ = 31517005188.

The previous prime is 31517005183. The next prime is 31517005217. The reversal of 31517005189 is 98150071513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27312520225 + 4204484964 = 165265^2 + 64842^2 .

It is a cyclic number.

It is not a de Polignac number, because 31517005189 - 2⁷ = 31517005061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31517005183) 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, 15758502594 + 15758502595.

It is an arithmetic number, because the mean of its divisors is an integer number (15758502595).

Almost surely, 2^31517005189 is an apocalyptic number.

It is an amenable number.

31517005189 is a deficient number, since it is larger than the sum of its proper divisors (1).

31517005189 is an equidigital number, since it uses as much as digits as its factorization.

31517005189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 40.

The spelling of 31517005189 in words is "thirty-one billion, five hundred seventeen million, five thousand, one hundred eighty-nine".