25621249 has 4 divisors (see below), whose sum is σ = 26217136. Its totient is φ = 25025364.

The previous prime is 25621237. The next prime is 25621259. The reversal of 25621249 is 94212652.

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 25621249 - 2¹⁵ = 25588481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25621249.

It is not an unprimeable number, because it can be changed into a prime (25621259) 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, 297879 + ... + 297964.

It is an arithmetic number, because the mean of its divisors is an integer number (6554284).

Almost surely, 2^25621249 is an apocalyptic number.

It is an amenable number.

25621249 is a deficient number, since it is larger than the sum of its proper divisors (595887).

25621249 is an equidigital number, since it uses as much as digits as its factorization.

25621249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595886.

The product of its digits is 8640, while the sum is 31.

The square root of 25621249 is about 5061.7436718981. The cubic root of 25621249 is about 294.8040410748.

The spelling of 25621249 in words is "twenty-five million, six hundred twenty-one thousand, two hundred forty-nine".