25255521 has 6 divisors (see below), whose sum is σ = 36480210. Its totient is φ = 16837008.

The previous prime is 25255519. The next prime is 25255547. The reversal of 25255521 is 12555252.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 2359296 = 4785^2 + 1536^2 .

It is not a de Polignac number, because 25255521 - 2¹ = 25255519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25255501) 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 5 ways as a sum of consecutive naturals, for example, 1403076 + ... + 1403093.

It is an arithmetic number, because the mean of its divisors is an integer number (6080035).

Almost surely, 2^25255521 is an apocalyptic number.

It is an amenable number.

25255521 is a deficient number, since it is larger than the sum of its proper divisors (11224689).

25255521 is a wasteful number, since it uses less digits than its factorization.

25255521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806175 (or 2806172 counting only the distinct ones).

The product of its digits is 5000, while the sum is 27.

The square root of 25255521 is about 5025.4871405666. The cubic root of 25255521 is about 293.3945962206.

The spelling of 25255521 in words is "twenty-five million, two hundred fifty-five thousand, five hundred twenty-one".