25543261 has 4 divisors (see below), whose sum is σ = 25553632. Its totient is φ = 25532892.

The previous prime is 25543253. The next prime is 25543289. The reversal of 25543261 is 16234552.

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 25543261 - 2³ = 25543253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25543291) 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, 856 + ... + 7198.

It is an arithmetic number, because the mean of its divisors is an integer number (6388408).

Almost surely, 2^25543261 is an apocalyptic number.

It is an amenable number.

25543261 is a deficient number, since it is larger than the sum of its proper divisors (10371).

25543261 is an equidigital number, since it uses as much as digits as its factorization.

25543261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10370.

The product of its digits is 7200, while the sum is 28.

The square root of 25543261 is about 5054.0341312658. The cubic root of 25543261 is about 294.5046210564.

The spelling of 25543261 in words is "twenty-five million, five hundred forty-three thousand, two hundred sixty-one".