25320581 has 12 divisors (see below), whose sum is σ = 29974476. Its totient is φ = 21246720.

The previous prime is 25320577. The next prime is 25320601. The reversal of 25320581 is 18502352.

It can be written as a sum of positive squares in 2 ways, for example, as 8755681 + 16564900 = 2959^2 + 4070^2 .

It is not a de Polignac number, because 25320581 - 2² = 25320577 is a prime.

It is a super-2 number, since 2×25320581² = 1282263644355122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25320581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25320571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6476 + ... + 9621.

It is an arithmetic number, because the mean of its divisors is an integer number (2497873).

Almost surely, 2^25320581 is an apocalyptic number.

It is an amenable number.

25320581 is a deficient number, since it is larger than the sum of its proper divisors (4653895).

25320581 is a wasteful number, since it uses less digits than its factorization.

25320581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16132 (or 16121 counting only the distinct ones).

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

The square root of 25320581 is about 5031.9559815245. The cubic root of 25320581 is about 293.6463152402.

The spelling of 25320581 in words is "twenty-five million, three hundred twenty thousand, five hundred eighty-one".