25397251 has 4 divisors (see below), whose sum is σ = 27706104. Its totient is φ = 23088400.

The previous prime is 25397231. The next prime is 25397257. The reversal of 25397251 is 15279352.

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 25397251 - 2⁹ = 25396739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25397257) 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, 1154410 + ... + 1154431.

It is an arithmetic number, because the mean of its divisors is an integer number (6926526).

Almost surely, 2^25397251 is an apocalyptic number.

25397251 is a deficient number, since it is larger than the sum of its proper divisors (2308853).

25397251 is a wasteful number, since it uses less digits than its factorization.

25397251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308852.

The product of its digits is 18900, while the sum is 34.

The square root of 25397251 is about 5039.5685331187. The cubic root of 25397251 is about 293.9424008284.

The spelling of 25397251 in words is "twenty-five million, three hundred ninety-seven thousand, two hundred fifty-one".