25240491 has 20 divisors (see below), whose sum is σ = 37862352. Its totient is φ = 16756848.

The previous prime is 25240483. The next prime is 25240513. The reversal of 25240491 is 19404252.

25240491 is a `hidden beast` number, since 252 + 404 + 9 + 1 = 666.

It is not a de Polignac number, because 25240491 - 2³ = 25240483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25240091) 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 19 ways as a sum of consecutive naturals, for example, 25186 + ... + 26168.

Almost surely, 2^25240491 is an apocalyptic number.

25240491 is a deficient number, since it is larger than the sum of its proper divisors (12621861).

25240491 is an equidigital number, since it uses as much as digits as its factorization.

25240491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 25240491 is about 5023.9915405980. The cubic root of 25240491 is about 293.3363832614.

The spelling of 25240491 in words is "twenty-five million, two hundred forty thousand, four hundred ninety-one".