25559551 has 4 divisors (see below), whose sum is σ = 27063072. Its totient is φ = 24056032.

The previous prime is 25559543. The next prime is 25559623. The reversal of 25559551 is 15595552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25559551 - 2³ = 25559543 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 25559551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25559951) 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, 751735 + ... + 751768.

It is an arithmetic number, because the mean of its divisors is an integer number (6765768).

Almost surely, 2^25559551 is an apocalyptic number.

25559551 is a deficient number, since it is larger than the sum of its proper divisors (1503521).

25559551 is a wasteful number, since it uses less digits than its factorization.

25559551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503520.

The product of its digits is 56250, while the sum is 37.

The square root of 25559551 is about 5055.6454582971. The cubic root of 25559551 is about 294.5672137012.

The spelling of 25559551 in words is "twenty-five million, five hundred fifty-nine thousand, five hundred fifty-one".