313439989 has 2 divisors, whose sum is σ = 313439990. Its totient is φ = 313439988.

The previous prime is 313439983. The next prime is 313440031. The reversal of 313439989 is 989934313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283922500 + 29517489 = 16850^2 + 5433^2 .

It is a cyclic number.

It is not a de Polignac number, because 313439989 - 2¹¹ = 313437941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313439983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156719994 + 156719995.

It is an arithmetic number, because the mean of its divisors is an integer number (156719995).

Almost surely, 2^313439989 is an apocalyptic number.

It is an amenable number.

313439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

313439989 is an equidigital number, since it uses as much as digits as its factorization.

313439989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 49.

The square root of 313439989 is about 17704.2364704045. The cubic root of 313439989 is about 679.2841291276.

The spelling of 313439989 in words is "three hundred thirteen million, four hundred thirty-nine thousand, nine hundred eighty-nine".