25453921 has 4 divisors (see below), whose sum is σ = 25466032. Its totient is φ = 25441812.

The previous prime is 25453877. The next prime is 25453933. The reversal of 25453921 is 12935452.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25453921 - 2²¹ = 23356769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25453991) 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, 1995 + ... + 7408.

It is an arithmetic number, because the mean of its divisors is an integer number (6366508).

Almost surely, 2^25453921 is an apocalyptic number.

It is an amenable number.

25453921 is a deficient number, since it is larger than the sum of its proper divisors (12111).

25453921 is an equidigital number, since it uses as much as digits as its factorization.

25453921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12110.

The product of its digits is 10800, while the sum is 31.

The square root of 25453921 is about 5045.1879053213. The cubic root of 25453921 is about 294.1608672744.

The spelling of 25453921 in words is "twenty-five million, four hundred fifty-three thousand, nine hundred twenty-one".