25551903 has 16 divisors (see below), whose sum is σ = 38622080. Its totient is φ = 14896224.

The previous prime is 25551887. The next prime is 25551923. The reversal of 25551903 is 30915552.

It is not a de Polignac number, because 25551903 - 2⁴ = 25551887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25551923) 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 15 ways as a sum of consecutive naturals, for example, 16501 + ... + 17982.

It is an arithmetic number, because the mean of its divisors is an integer number (2413880).

Almost surely, 2^25551903 is an apocalyptic number.

25551903 is a deficient number, since it is larger than the sum of its proper divisors (13070177).

25551903 is a wasteful number, since it uses less digits than its factorization.

25551903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34518.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 25551903 is about 5054.8890195532. The cubic root of 25551903 is about 294.5378303631.

It can be divided in two parts, 2555190 and 3, that multiplied together give a triangular number (7665570 = T₃₉₁₅).

The spelling of 25551903 in words is "twenty-five million, five hundred fifty-one thousand, nine hundred three".