25297491 has 4 divisors (see below), whose sum is σ = 33729992. Its totient is φ = 16864992.

The previous prime is 25297471. The next prime is 25297499. The reversal of 25297491 is 19479252.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25297491 - 2¹¹ = 25295443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25297499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4216246 + ... + 4216251.

It is an arithmetic number, because the mean of its divisors is an integer number (8432498).

Almost surely, 2^25297491 is an apocalyptic number.

25297491 is a deficient number, since it is larger than the sum of its proper divisors (8432501).

25297491 is an equidigital number, since it uses as much as digits as its factorization.

25297491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8432500.

The product of its digits is 45360, while the sum is 39.

The square root of 25297491 is about 5029.6611217854. The cubic root of 25297491 is about 293.5570287758.

The spelling of 25297491 in words is "twenty-five million, two hundred ninety-seven thousand, four hundred ninety-one".