315205551 has 24 divisors (see below), whose sum is σ = 497637504. Its totient is φ = 191393280.

The previous prime is 315205543. The next prime is 315205559. The reversal of 315205551 is 155502513.

It is an interprime number because it is at equal distance from previous prime (315205543) and next prime (315205559).

It is not a de Polignac number, because 315205551 - 2³ = 315205543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315205559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28486 + ... + 37971.

It is an arithmetic number, because the mean of its divisors is an integer number (20734896).

Almost surely, 2^315205551 is an apocalyptic number.

315205551 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

315205551 is a deficient number, since it is larger than the sum of its proper divisors (182431953).

315205551 is a wasteful number, since it uses less digits than its factorization.

315205551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66511 (or 66508 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 315205551 is about 17754.0291483370. The cubic root of 315205551 is about 680.5571781388.

The spelling of 315205551 in words is "three hundred fifteen million, two hundred five thousand, five hundred fifty-one".