25231551 has 16 divisors (see below), whose sum is σ = 35389440. Its totient is φ = 15968160.

The previous prime is 25231513. The next prime is 25231561. The reversal of 25231551 is 15513252.

It is a happy number.

It is not a de Polignac number, because 25231551 - 2⁹ = 25231039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25231561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2370 + ... + 7488.

It is an arithmetic number, because the mean of its divisors is an integer number (2211840).

Almost surely, 2^25231551 is an apocalyptic number.

25231551 is a deficient number, since it is larger than the sum of its proper divisors (10157889).

25231551 is a wasteful number, since it uses less digits than its factorization.

25231551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5206.

The product of its digits is 1500, while the sum is 24.

The square root of 25231551 is about 5023.1017310025. The cubic root of 25231551 is about 293.3017466275.

The spelling of 25231551 in words is "twenty-five million, two hundred thirty-one thousand, five hundred fifty-one".