25534551 has 32 divisors (see below), whose sum is σ = 40711680. Its totient is φ = 13931136.

The previous prime is 25534547. The next prime is 25534559. The reversal of 25534551 is 15543552.

It is a happy number.

It is not a de Polignac number, because 25534551 - 2² = 25534547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25534559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45565 + ... + 46121.

It is an arithmetic number, because the mean of its divisors is an integer number (1272240).

Almost surely, 2^25534551 is an apocalyptic number.

25534551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25534551 is a deficient number, since it is larger than the sum of its proper divisors (15177129).

25534551 is a wasteful number, since it uses less digits than its factorization.

25534551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663.

The product of its digits is 15000, while the sum is 30.

The square root of 25534551 is about 5053.1723699078. The cubic root of 25534551 is about 294.4711428608.

Subtracting from 25534551 its reverse (15543552), we obtain a palindrome (9990999).

The spelling of 25534551 in words is "twenty-five million, five hundred thirty-four thousand, five hundred fifty-one".