25532561 has 16 divisors (see below), whose sum is σ = 28200960. Its totient is φ = 23023440.

The previous prime is 25532537. The next prime is 25532569. The reversal of 25532561 is 16523552.

It is a happy number.

It is not a de Polignac number, because 25532561 - 2²² = 21338257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25532569) 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, 39140 + ... + 39786.

It is an arithmetic number, because the mean of its divisors is an integer number (1762560).

Almost surely, 2^25532561 is an apocalyptic number.

It is an amenable number.

25532561 is a deficient number, since it is larger than the sum of its proper divisors (2668399).

25532561 is a wasteful number, since it uses less digits than its factorization.

25532561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its digits is 9000, while the sum is 29.

The square root of 25532561 is about 5052.9754600631. The cubic root of 25532561 is about 294.4634929280.

Subtracting from 25532561 its reverse (16523552), we obtain a palindrome (9009009).

The spelling of 25532561 in words is "twenty-five million, five hundred thirty-two thousand, five hundred sixty-one".