25497257 has 4 divisors (see below), whose sum is σ = 25568640. Its totient is φ = 25425876.

The previous prime is 25497239. The next prime is 25497281. The reversal of 25497257 is 75279452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25497257 - 2⁶ = 25497193 is a prime.

It is a super-2 number, since 2×25497257² = 1300220229048098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25497217) 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 in 3 ways as a sum of consecutive naturals, for example, 35153 + ... + 35870.

It is an arithmetic number, because the mean of its divisors is an integer number (6392160).

Almost surely, 2^25497257 is an apocalyptic number.

It is an amenable number.

25497257 is a deficient number, since it is larger than the sum of its proper divisors (71383).

25497257 is an equidigital number, since it uses as much as digits as its factorization.

25497257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71382.

The product of its digits is 176400, while the sum is 41.

The square root of 25497257 is about 5049.4808644058. The cubic root of 25497257 is about 294.3277116113.

The spelling of 25497257 in words is "twenty-five million, four hundred ninety-seven thousand, two hundred fifty-seven".