315911221 has 8 divisors (see below), whose sum is σ = 334713600. Its totient is φ = 297133248.

The previous prime is 315911201. The next prime is 315911227. The reversal of 315911221 is 122119513.

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

It is a cyclic number.

It is not a de Polignac number, because 315911221 - 2⁷ = 315911093 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 (315911227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25180 + ... + 35578.

It is an arithmetic number, because the mean of its divisors is an integer number (41839200).

Almost surely, 2^315911221 is an apocalyptic number.

It is an amenable number.

315911221 is a deficient number, since it is larger than the sum of its proper divisors (18802379).

315911221 is a wasteful number, since it uses less digits than its factorization.

315911221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12203.

The product of its digits is 540, while the sum is 25.

The square root of 315911221 is about 17773.8915547496. The cubic root of 315911221 is about 681.0646679763.

The spelling of 315911221 in words is "three hundred fifteen million, nine hundred eleven thousand, two hundred twenty-one".