25228491 has 4 divisors (see below), whose sum is σ = 33637992. Its totient is φ = 16818992.

The previous prime is 25228481. The next prime is 25228507. The reversal of 25228491 is 19482252.

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

It is a cyclic number.

It is not a de Polignac number, because 25228491 - 2⁷ = 25228363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25228421) 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, 4204746 + ... + 4204751.

It is an arithmetic number, because the mean of its divisors is an integer number (8409498).

Almost surely, 2^25228491 is an apocalyptic number.

25228491 is a deficient number, since it is larger than the sum of its proper divisors (8409501).

25228491 is an equidigital number, since it uses as much as digits as its factorization.

25228491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409500.

The product of its digits is 11520, while the sum is 33.

The square root of 25228491 is about 5022.7971290905. The cubic root of 25228491 is about 293.2898892559.

The spelling of 25228491 in words is "twenty-five million, two hundred twenty-eight thousand, four hundred ninety-one".