315261921 has 8 divisors (see below), whose sum is σ = 452683840. Its totient is φ = 194007312.

The previous prime is 315261917. The next prime is 315261937. The reversal of 315261921 is 129162513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 315261921 - 2² = 315261917 is a prime.

It is a super-3 number, since 3×315261921³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315261901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4041781 + ... + 4041858.

It is an arithmetic number, because the mean of its divisors is an integer number (56585480).

Almost surely, 2^315261921 is an apocalyptic number.

It is an amenable number.

315261921 is a deficient number, since it is larger than the sum of its proper divisors (137421919).

315261921 is a wasteful number, since it uses less digits than its factorization.

315261921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8083655.

The product of its digits is 3240, while the sum is 30.

The square root of 315261921 is about 17755.6166043311. The cubic root of 315261921 is about 680.5977450232.

The spelling of 315261921 in words is "three hundred fifteen million, two hundred sixty-one thousand, nine hundred twenty-one".