25256491 has 8 divisors (see below), whose sum is σ = 28631120. Its totient is φ = 22086432.

The previous prime is 25256479. The next prime is 25256513. The reversal of 25256491 is 19465252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25256491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25256431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50880 + ... + 51373.

It is an arithmetic number, because the mean of its divisors is an integer number (3578890).

Almost surely, 2^25256491 is an apocalyptic number.

25256491 is a deficient number, since it is larger than the sum of its proper divisors (3374629).

25256491 is a wasteful number, since it uses less digits than its factorization.

25256491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102285.

The product of its digits is 21600, while the sum is 34.

The square root of 25256491 is about 5025.5836476971. The cubic root of 25256491 is about 293.3983523513.

The spelling of 25256491 in words is "twenty-five million, two hundred fifty-six thousand, four hundred ninety-one".