315506261 has 4 divisors (see below), whose sum is σ = 360578592. Its totient is φ = 270433932.

The previous prime is 315506239. The next prime is 315506263. The reversal of 315506261 is 162605513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 315506261 - 2¹⁴ = 315489877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315506263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22536155 + ... + 22536168.

It is an arithmetic number, because the mean of its divisors is an integer number (90144648).

Almost surely, 2^315506261 is an apocalyptic number.

It is an amenable number.

315506261 is a deficient number, since it is larger than the sum of its proper divisors (45072331).

315506261 is an equidigital number, since it uses as much as digits as its factorization.

315506261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45072330.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 315506261 is about 17762.4959113296. The cubic root of 315506261 is about 680.7735293454.

The spelling of 315506261 in words is "three hundred fifteen million, five hundred six thousand, two hundred sixty-one".