315887189 has 2 divisors, whose sum is σ = 315887190. Its totient is φ = 315887188.

The previous prime is 315887177. The next prime is 315887191. The reversal of 315887189 is 981788513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315666289 + 220900 = 17767^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 315887189 - 2²⁰ = 314838613 is a prime.

Together with 315887191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315887119) 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, 157943594 + 157943595.

It is an arithmetic number, because the mean of its divisors is an integer number (157943595).

Almost surely, 2^315887189 is an apocalyptic number.

It is an amenable number.

315887189 is a deficient number, since it is larger than the sum of its proper divisors (1).

315887189 is an equidigital number, since it uses as much as digits as its factorization.

315887189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 50.

The square root of 315887189 is about 17773.2154941080. The cubic root of 315887189 is about 681.0473975534.

The spelling of 315887189 in words is "three hundred fifteen million, eight hundred eighty-seven thousand, one hundred eighty-nine".