316256621 has 2 divisors, whose sum is σ = 316256622. Its totient is φ = 316256620.

The previous prime is 316256617. The next prime is 316256623. The reversal of 316256621 is 126652613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179694025 + 136562596 = 13405^2 + 11686^2 .

It is a cyclic number.

It is not a de Polignac number, because 316256621 - 2² = 316256617 is a prime.

Together with 316256623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316256623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158128310 + 158128311.

It is an arithmetic number, because the mean of its divisors is an integer number (158128311).

Almost surely, 2^316256621 is an apocalyptic number.

It is an amenable number.

316256621 is a deficient number, since it is larger than the sum of its proper divisors (1).

316256621 is an equidigital number, since it uses as much as digits as its factorization.

316256621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 316256621 is about 17783.6053993559. The cubic root of 316256621 is about 681.3127904866.

The spelling of 316256621 in words is "three hundred sixteen million, two hundred fifty-six thousand, six hundred twenty-one".