313571989 has 2 divisors, whose sum is σ = 313571990. Its totient is φ = 313571988.

The previous prime is 313571981. The next prime is 313572001. The reversal of 313571989 is 989175313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270865764 + 42706225 = 16458^2 + 6535^2 .

It is a cyclic number.

It is not a de Polignac number, because 313571989 - 2³ = 313571981 is a prime.

It is a super-2 number, since 2×313571989² = 196654784570832242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313571981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156785994 + 156785995.

It is an arithmetic number, because the mean of its divisors is an integer number (156785995).

Almost surely, 2^313571989 is an apocalyptic number.

It is an amenable number.

313571989 is a deficient number, since it is larger than the sum of its proper divisors (1).

313571989 is an equidigital number, since it uses as much as digits as its factorization.

313571989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 46.

The square root of 313571989 is about 17707.9639992857. The cubic root of 313571989 is about 679.3794721216.

The spelling of 313571989 in words is "three hundred thirteen million, five hundred seventy-one thousand, nine hundred eighty-nine".