313561979 has 2 divisors, whose sum is σ = 313561980. Its totient is φ = 313561978.

The previous prime is 313561951. The next prime is 313562017. The reversal of 313561979 is 979165313.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313561979 is a prime.

It is a super-2 number, since 2×313561979² = 196642229348792882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (313561279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156780989 + 156780990.

It is an arithmetic number, because the mean of its divisors is an integer number (156780990).

Almost surely, 2^313561979 is an apocalyptic number.

313561979 is a deficient number, since it is larger than the sum of its proper divisors (1).

313561979 is an equidigital number, since it uses as much as digits as its factorization.

313561979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 44.

The square root of 313561979 is about 17707.6813558410. The cubic root of 313561979 is about 679.3722428822.

The spelling of 313561979 in words is "three hundred thirteen million, five hundred sixty-one thousand, nine hundred seventy-nine".