2537681 has 2 divisors, whose sum is σ = 2537682. Its totient is φ = 2537680.

The previous prime is 2537677. The next prime is 2537701. The reversal of 2537681 is 1867352.

It is a happy number.

2537681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2531281 + 6400 = 1591^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 2537681 - 2² = 2537677 is a prime.

It is a super-2 number, since 2×2537681² = 12879649715522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2537081) 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 as a sum of consecutive naturals, namely, 1268840 + 1268841.

It is an arithmetic number, because the mean of its divisors is an integer number (1268841).

2^2537681 is an apocalyptic number.

It is an amenable number.

2537681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2537681 is an equidigital number, since it uses as much as digits as its factorization.

2537681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 2537681 is about 1593.0100439106. The cubic root of 2537681 is about 136.3993631776.

Subtracting from 2537681 its sum of digits (32), we obtain a square (2537649 = 1593²).

The spelling of 2537681 in words is "two million, five hundred thirty-seven thousand, six hundred eighty-one".