25513551 has 12 divisors (see below), whose sum is σ = 42117712. Its totient is φ = 14579136.

The previous prime is 25513529. The next prime is 25513559. The reversal of 25513551 is 15531552.

It is not a de Polignac number, because 25513551 - 2⁵ = 25513519 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25513559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202426 + ... + 202551.

Almost surely, 2^25513551 is an apocalyptic number.

25513551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25513551 is a deficient number, since it is larger than the sum of its proper divisors (16604161).

25513551 is a wasteful number, since it uses less digits than its factorization.

25513551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404990 (or 404987 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 25513551 is about 5051.0940399086. The cubic root of 25513551 is about 294.3903948837.

The spelling of 25513551 in words is "twenty-five million, five hundred thirteen thousand, five hundred fifty-one".