2537721 has 12 divisors (see below), whose sum is σ = 3679572. Its totient is φ = 1685376.

The previous prime is 2537701. The next prime is 2537729. The reversal of 2537721 is 1277352.

It can be written as a sum of positive squares in 2 ways, for example, as 1010025 + 1527696 = 1005^2 + 1236^2 .

It is not a de Polignac number, because 2537721 - 2⁷ = 2537593 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 5³ + 3¹³ + 7⁶ + 7⁷ + 2¹¹ + 1 .

It is not an unprimeable number, because it can be changed into a prime (2537729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3805 + ... + 4421.

It is an arithmetic number, because the mean of its divisors is an integer number (306631).

2^2537721 is an apocalyptic number.

It is an amenable number.

2537721 is a deficient number, since it is larger than the sum of its proper divisors (1141851).

2537721 is a wasteful number, since it uses less digits than its factorization.

2537721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1077 counting only the distinct ones).

The product of its digits is 2940, while the sum is 27.

The square root of 2537721 is about 1593.0225987098. The cubic root of 2537721 is about 136.4000798353.

The spelling of 2537721 in words is "two million, five hundred thirty-seven thousand, seven hundred twenty-one".