25648251 has 4 divisors (see below), whose sum is σ = 34197672. Its totient is φ = 17098832.

The previous prime is 25648201. The next prime is 25648277. The reversal of 25648251 is 15284652.

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 25648251 - 2⁷ = 25648123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25648201) 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, 4274706 + ... + 4274711.

It is an arithmetic number, because the mean of its divisors is an integer number (8549418).

Almost surely, 2^25648251 is an apocalyptic number.

25648251 is a deficient number, since it is larger than the sum of its proper divisors (8549421).

25648251 is an equidigital number, since it uses as much as digits as its factorization.

25648251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8549420.

The product of its digits is 19200, while the sum is 33.

The square root of 25648251 is about 5064.4102321988. The cubic root of 25648251 is about 294.9075684754.

The spelling of 25648251 in words is "twenty-five million, six hundred forty-eight thousand, two hundred fifty-one".