315723321 has 12 divisors (see below), whose sum is σ = 462292948. Its totient is φ = 207598464.

The previous prime is 315723301. The next prime is 315723341. The reversal of 315723321 is 123327513.

315723321 is a `hidden beast` number, since 315 + 7 + 23 + 321 = 666.

It is an interprime number because it is at equal distance from previous prime (315723301) and next prime (315723341).

It can be written as a sum of positive squares in 2 ways, for example, as 134444025 + 181279296 = 11595^2 + 13464^2 .

It is not a de Polignac number, because 315723321 - 2²⁵ = 282168889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (315723301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239620 + ... + 240933.

Almost surely, 2^315723321 is an apocalyptic number.

It is an amenable number.

315723321 is a deficient number, since it is larger than the sum of its proper divisors (146569627).

315723321 is a wasteful number, since it uses less digits than its factorization.

315723321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480632 (or 480629 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 315723321 is about 17768.6049255421. The cubic root of 315723321 is about 680.9296116450.

The spelling of 315723321 in words is "three hundred fifteen million, seven hundred twenty-three thousand, three hundred twenty-one".