25493257 has 4 divisors (see below), whose sum is σ = 25505536. Its totient is φ = 25480980.

The previous prime is 25493227. The next prime is 25493261. The reversal of 25493257 is 75239452.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25493257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25493207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2169 + ... + 7462.

It is an arithmetic number, because the mean of its divisors is an integer number (6376384).

Almost surely, 2^25493257 is an apocalyptic number.

It is an amenable number.

25493257 is a deficient number, since it is larger than the sum of its proper divisors (12279).

25493257 is an equidigital number, since it uses as much as digits as its factorization.

25493257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12278.

The product of its digits is 75600, while the sum is 37.

The square root of 25493257 is about 5049.0847685496. The cubic root of 25493257 is about 294.3123194665.

The spelling of 25493257 in words is "twenty-five million, four hundred ninety-three thousand, two hundred fifty-seven".