25257761 has 2 divisors, whose sum is σ = 25257762. Its totient is φ = 25257760.

The previous prime is 25257737. The next prime is 25257769. The reversal of 25257761 is 16775252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23580736 + 1677025 = 4856^2 + 1295^2 .

It is a cyclic number.

It is not a de Polignac number, because 25257761 - 2¹⁸ = 24995617 is a prime.

It is not a weakly prime, because it can be changed into another prime (25257769) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628880 + 12628881.

It is an arithmetic number, because the mean of its divisors is an integer number (12628881).

Almost surely, 2^25257761 is an apocalyptic number.

It is an amenable number.

25257761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25257761 is an equidigital number, since it uses as much as digits as its factorization.

25257761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29400, while the sum is 35.

The square root of 25257761 is about 5025.7099995921. The cubic root of 25257761 is about 293.4032700266.

The spelling of 25257761 in words is "twenty-five million, two hundred fifty-seven thousand, seven hundred sixty-one".