25256621 has 8 divisors (see below), whose sum is σ = 27291264. Its totient is φ = 23235120.

The previous prime is 25256597. The next prime is 25256633. The reversal of 25256621 is 12665252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25256621 - 2⁶ = 25256557 is a prime.

It is a super-3 number, since 3×25256621³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25256641) 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 7 ways as a sum of consecutive naturals, for example, 920 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (3411408).

Almost surely, 2^25256621 is an apocalyptic number.

It is an amenable number.

25256621 is a deficient number, since it is larger than the sum of its proper divisors (2034643).

25256621 is a wasteful number, since it uses less digits than its factorization.

25256621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6571.

The product of its digits is 7200, while the sum is 29.

The square root of 25256621 is about 5025.5965815015. The cubic root of 25256621 is about 293.3988557430.

The spelling of 25256621 in words is "twenty-five million, two hundred fifty-six thousand, six hundred twenty-one".