25528251 has 8 divisors (see below), whose sum is σ = 38900224. Its totient is φ = 14587560.

The previous prime is 25528249. The next prime is 25528259. The reversal of 25528251 is 15282552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25528251 - 2¹ = 25528249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25528259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607795 + ... + 607836.

It is an arithmetic number, because the mean of its divisors is an integer number (4862528).

Almost surely, 2^25528251 is an apocalyptic number.

25528251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25528251 is a deficient number, since it is larger than the sum of its proper divisors (13371973).

25528251 is a wasteful number, since it uses less digits than its factorization.

25528251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215641.

The product of its digits is 8000, while the sum is 30.

The square root of 25528251 is about 5052.5489606732. The cubic root of 25528251 is about 294.4469231177.

The spelling of 25528251 in words is "twenty-five million, five hundred twenty-eight thousand, two hundred fifty-one".