315656251 has 2 divisors, whose sum is σ = 315656252. Its totient is φ = 315656250.

The previous prime is 315656207. The next prime is 315656303. The reversal of 315656251 is 152656513.

It is a weak prime.

It is an emirp because it is prime and its reverse (152656513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315656251 - 2⁷ = 315656123 is a prime.

It is a super-3 number, since 3×315656251³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (315656651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157828125 + 157828126.

It is an arithmetic number, because the mean of its divisors is an integer number (157828126).

Almost surely, 2^315656251 is an apocalyptic number.

315656251 is a deficient number, since it is larger than the sum of its proper divisors (1).

315656251 is an equidigital number, since it uses as much as digits as its factorization.

315656251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 315656251 is about 17766.7175077446. The cubic root of 315656251 is about 680.8813909611.

The spelling of 315656251 in words is "three hundred fifteen million, six hundred fifty-six thousand, two hundred fifty-one".