25118521 has 4 divisors (see below), whose sum is σ = 25131600. Its totient is φ = 25105444.

The previous prime is 25118491. The next prime is 25118531. The reversal of 25118521 is 12581152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25118521 - 2⁷ = 25118393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25118531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3031 + ... + 7708.

It is an arithmetic number, because the mean of its divisors is an integer number (6282900).

Almost surely, 2^25118521 is an apocalyptic number.

It is an amenable number.

25118521 is a deficient number, since it is larger than the sum of its proper divisors (13079).

25118521 is a wasteful number, since it uses less digits than its factorization.

25118521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13078.

The product of its digits is 800, while the sum is 25.

The square root of 25118521 is about 5011.8380859721. The cubic root of 25118521 is about 292.8631222031.

Adding to 25118521 its reverse (12581152), we get a palindrome (37699673).

The spelling of 25118521 in words is "twenty-five million, one hundred eighteen thousand, five hundred twenty-one".