25572621 has 4 divisors (see below), whose sum is σ = 34096832. Its totient is φ = 17048412.

The previous prime is 25572611. The next prime is 25572623. The reversal of 25572621 is 12627552.

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 not a de Polignac number, because 25572621 - 2⁹ = 25572109 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 (25572623) 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 3 ways as a sum of consecutive naturals, for example, 4262101 + ... + 4262106.

It is an arithmetic number, because the mean of its divisors is an integer number (8524208).

Almost surely, 2^25572621 is an apocalyptic number.

It is an amenable number.

25572621 is a deficient number, since it is larger than the sum of its proper divisors (8524211).

25572621 is an equidigital number, since it uses as much as digits as its factorization.

25572621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8524210.

The product of its digits is 8400, while the sum is 30.

The square root of 25572621 is about 5056.9379074693. The cubic root of 25572621 is about 294.6174146017.

The spelling of 25572621 in words is "twenty-five million, five hundred seventy-two thousand, six hundred twenty-one".