2315721 has 16 divisors (see below), whose sum is σ = 3221568. Its totient is φ = 1478400.

The previous prime is 2315707. The next prime is 2315759. The reversal of 2315721 is 1275132.

2315721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2315721 - 2⁶ = 2315657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2315771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8101 + ... + 8381.

It is an arithmetic number, because the mean of its divisors is an integer number (201348).

2^2315721 is an apocalyptic number.

It is an amenable number.

2315721 is a deficient number, since it is larger than the sum of its proper divisors (905847).

2315721 is a wasteful number, since it uses less digits than its factorization.

2315721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392.

The product of its digits is 420, while the sum is 21.

The square root of 2315721 is about 1521.7493223261. The cubic root of 2315721 is about 132.3006804971.

The spelling of 2315721 in words is "two million, three hundred fifteen thousand, seven hundred twenty-one".