315233121 has 16 divisors (see below), whose sum is σ = 490160000. Its totient is φ = 180132624.

The previous prime is 315233119. The next prime is 315233131. The reversal of 315233121 is 121332513.

It is not a de Polignac number, because 315233121 - 2¹ = 315233119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315233131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152146 + ... + 154203.

It is an arithmetic number, because the mean of its divisors is an integer number (30635000).

Almost surely, 2^315233121 is an apocalyptic number.

It is an amenable number.

315233121 is a deficient number, since it is larger than the sum of its proper divisors (174926879).

315233121 is an equidigital number, since it uses as much as digits as its factorization.

315233121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306373 (or 306359 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 315233121 is about 17754.8055748296. The cubic root of 315233121 is about 680.5770195982.

Adding to 315233121 its reverse (121332513), we get a palindrome (436565634).

The spelling of 315233121 in words is "three hundred fifteen million, two hundred thirty-three thousand, one hundred twenty-one".