318725989 has 2 divisors, whose sum is σ = 318725990. Its totient is φ = 318725988.

The previous prime is 318725963. The next prime is 318725993. The reversal of 318725989 is 989527813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221861025 + 96864964 = 14895^2 + 9842^2 .

It is a cyclic number.

It is not a de Polignac number, because 318725989 - 2⁷ = 318725861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318729989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159362994 + 159362995.

It is an arithmetic number, because the mean of its divisors is an integer number (159362995).

Almost surely, 2^318725989 is an apocalyptic number.

It is an amenable number.

318725989 is a deficient number, since it is larger than the sum of its proper divisors (1).

318725989 is an equidigital number, since it uses as much as digits as its factorization.

318725989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 52.

The square root of 318725989 is about 17852.8986161912. The cubic root of 318725989 is about 683.0814512995.

The spelling of 318725989 in words is "three hundred eighteen million, seven hundred twenty-five thousand, nine hundred eighty-nine".