125809550 has 24 divisors (see below), whose sum is σ = 234488712. Its totient is φ = 50220000.

The previous prime is 125809549. The next prime is 125809561. The reversal of 125809550 is 55908521.

It is a self number, because there is not a number n which added to its sum of digits gives 125809550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24725 + ... + 29375.

It is an arithmetic number, because the mean of its divisors is an integer number (9770363).

Almost surely, 2^125809550 is an apocalyptic number.

125809550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

125809550 is a deficient number, since it is larger than the sum of its proper divisors (108679162).

125809550 is a wasteful number, since it uses less digits than its factorization.

125809550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204 (or 5199 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 125809550 is about 11216.4856349928. The cubic root of 125809550 is about 501.0770781393.

The spelling of 125809550 in words is "one hundred twenty-five million, eight hundred nine thousand, five hundred fifty".