2523581 has 2 divisors, whose sum is σ = 2523582. Its totient is φ = 2523580.

The previous prime is 2523569. The next prime is 2523589. The reversal of 2523581 is 1853252.

2523581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651225 + 872356 = 1285^2 + 934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2523581 - 2⁶ = 2523517 is a prime.

It is a super-2 number, since 2×2523581² = 12736922127122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2523581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2523589) 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, 1261790 + 1261791.

It is an arithmetic number, because the mean of its divisors is an integer number (1261791).

2^2523581 is an apocalyptic number.

It is an amenable number.

2523581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2523581 is an equidigital number, since it uses as much as digits as its factorization.

2523581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 2523581 is about 1588.5782952061. The cubic root of 2523581 is about 136.1462706831.

The spelling of 2523581 in words is "two million, five hundred twenty-three thousand, five hundred eighty-one".