25755521 has 4 divisors (see below), whose sum is σ = 28096944. Its totient is φ = 23414100.

The previous prime is 25755497. The next prime is 25755523. The reversal of 25755521 is 12555752.

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 25755521 - 2¹⁰ = 25754497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25755523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170695 + ... + 1170716.

It is an arithmetic number, because the mean of its divisors is an integer number (7024236).

Almost surely, 2^25755521 is an apocalyptic number.

It is an amenable number.

25755521 is a deficient number, since it is larger than the sum of its proper divisors (2341423).

25755521 is a wasteful number, since it uses less digits than its factorization.

25755521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341422.

The product of its digits is 17500, while the sum is 32.

The square root of 25755521 is about 5074.9897536842. The cubic root of 25755521 is about 295.3181323319.

The spelling of 25755521 in words is "twenty-five million, seven hundred fifty-five thousand, five hundred twenty-one".