2315521 has 4 divisors (see below), whose sum is σ = 2493652. Its totient is φ = 2137392.

The previous prime is 2315503. The next prime is 2315539. The reversal of 2315521 is 1255132.

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

It is an interprime number because it is at equal distance from previous prime (2315503) and next prime (2315539).

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 2143296 = 415^2 + 1464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2315521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2315581) 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, 89046 + ... + 89071.

It is an arithmetic number, because the mean of its divisors is an integer number (623413).

2^2315521 is an apocalyptic number.

It is an amenable number.

2315521 is a deficient number, since it is larger than the sum of its proper divisors (178131).

2315521 is a wasteful number, since it uses less digits than its factorization.

2315521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178130.

The product of its digits is 300, while the sum is 19.

The square root of 2315521 is about 1521.6836070616. The cubic root of 2315521 is about 132.2968716189.

The spelling of 2315521 in words is "two million, three hundred fifteen thousand, five hundred twenty-one".