2315921 has 4 divisors (see below), whose sum is σ = 2321844. Its totient is φ = 2310000.

The previous prime is 2315903. The next prime is 2315947. The reversal of 2315921 is 1295132.

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 1081600 + 1234321 = 1040^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2315921 - 2⁶ = 2315857 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 (2315981) 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, 2330 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (580461).

2^2315921 is an apocalyptic number.

It is an amenable number.

2315921 is a deficient number, since it is larger than the sum of its proper divisors (5923).

2315921 is an equidigital number, since it uses as much as digits as its factorization.

2315921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5922.

The product of its digits is 540, while the sum is 23.

The square root of 2315921 is about 1521.8150347529. The cubic root of 2315921 is about 132.3044891561.

The spelling of 2315921 in words is "two million, three hundred fifteen thousand, nine hundred twenty-one".