315128771 has 2 divisors, whose sum is σ = 315128772. Its totient is φ = 315128770.

The previous prime is 315128731. The next prime is 315128789. The reversal of 315128771 is 177821513.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 315128771 - 2²² = 310934467 is a prime.

It is a super-2 number, since 2×315128771² = 198612284623940882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (315128731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157564385 + 157564386.

It is an arithmetic number, because the mean of its divisors is an integer number (157564386).

Almost surely, 2^315128771 is an apocalyptic number.

315128771 is a deficient number, since it is larger than the sum of its proper divisors (1).

315128771 is an equidigital number, since it uses as much as digits as its factorization.

315128771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 35.

The square root of 315128771 is about 17751.8666905765. The cubic root of 315128771 is about 680.5019153394.

The spelling of 315128771 in words is "three hundred fifteen million, one hundred twenty-eight thousand, seven hundred seventy-one".