313656181 has 2 divisors, whose sum is σ = 313656182. Its totient is φ = 313656180.

The previous prime is 313656121. The next prime is 313656223. The reversal of 313656181 is 181656313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290702500 + 22953681 = 17050^2 + 4791^2 .

It is a cyclic number.

It is not a de Polignac number, because 313656181 - 2⁷ = 313656053 is a prime.

It is a super-2 number, since 2×313656181² = 196760399759009522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313656121) 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, 156828090 + 156828091.

It is an arithmetic number, because the mean of its divisors is an integer number (156828091).

Almost surely, 2^313656181 is an apocalyptic number.

It is an amenable number.

313656181 is a deficient number, since it is larger than the sum of its proper divisors (1).

313656181 is an equidigital number, since it uses as much as digits as its factorization.

313656181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 313656181 is about 17710.3410752024. The cubic root of 313656181 is about 679.4402696419.

The spelling of 313656181 in words is "three hundred thirteen million, six hundred fifty-six thousand, one hundred eighty-one".