25481621 has 4 divisors (see below), whose sum is σ = 27798144. Its totient is φ = 23165100.

The previous prime is 25481611. The next prime is 25481629. The reversal of 25481621 is 12618452.

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 25481621 - 2⁶ = 25481557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25481629) 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, 1158245 + ... + 1158266.

It is an arithmetic number, because the mean of its divisors is an integer number (6949536).

Almost surely, 2^25481621 is an apocalyptic number.

It is an amenable number.

25481621 is a deficient number, since it is larger than the sum of its proper divisors (2316523).

25481621 is a wasteful number, since it uses less digits than its factorization.

25481621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316522.

The product of its digits is 3840, while the sum is 29.

The square root of 25481621 is about 5047.9323489920. The cubic root of 25481621 is about 294.2675345609.

The spelling of 25481621 in words is "twenty-five million, four hundred eighty-one thousand, six hundred twenty-one".