315128903 has 2 divisors, whose sum is σ = 315128904. Its totient is φ = 315128902.

The previous prime is 315128899. The next prime is 315128917. The reversal of 315128903 is 309821513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315128903 - 2² = 315128899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315128903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315128923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157564451 + 157564452.

It is an arithmetic number, because the mean of its divisors is an integer number (157564452).

Almost surely, 2^315128903 is an apocalyptic number.

315128903 is a deficient number, since it is larger than the sum of its proper divisors (1).

315128903 is an equidigital number, since it uses as much as digits as its factorization.

315128903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 315128903 is about 17751.8704084950. The cubic root of 315128903 is about 680.5020103548.

The spelling of 315128903 in words is "three hundred fifteen million, one hundred twenty-eight thousand, nine hundred three".