315299221 has 4 divisors (see below), whose sum is σ = 333846252. Its totient is φ = 296752192.

The previous prime is 315299219. The next prime is 315299227. The reversal of 315299221 is 122992513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186022321 + 129276900 = 13639^2 + 11370^2 .

It is a cyclic number.

It is not a de Polignac number, because 315299221 - 2¹ = 315299219 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 (315299227) 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, 9273490 + ... + 9273523.

It is an arithmetic number, because the mean of its divisors is an integer number (83461563).

Almost surely, 2^315299221 is an apocalyptic number.

It is an amenable number.

315299221 is a deficient number, since it is larger than the sum of its proper divisors (18547031).

315299221 is a wasteful number, since it uses less digits than its factorization.

315299221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18547030.

The product of its digits is 9720, while the sum is 34.

The square root of 315299221 is about 17756.6669451223. Note that the first 3 decimals coincide. The cubic root of 315299221 is about 680.6245854513.

The spelling of 315299221 in words is "three hundred fifteen million, two hundred ninety-nine thousand, two hundred twenty-one".