25707581 has 2 divisors, whose sum is σ = 25707582. Its totient is φ = 25707580.

The previous prime is 25707559. The next prime is 25707623. The reversal of 25707581 is 18570752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15531481 + 10176100 = 3941^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 25707581 - 2¹⁸ = 25445437 is a prime.

It is a super-2 number, since 2×25707581² = 1321759441743122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25707511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12853790 + 12853791.

It is an arithmetic number, because the mean of its divisors is an integer number (12853791).

Almost surely, 2^25707581 is an apocalyptic number.

It is an amenable number.

25707581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25707581 is an equidigital number, since it uses as much as digits as its factorization.

25707581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 25707581 is about 5070.2643915283. The cubic root of 25707581 is about 295.1347885432.

The spelling of 25707581 in words is "twenty-five million, seven hundred seven thousand, five hundred eighty-one".