125199999 has 20 divisors (see below), whose sum is σ = 190100680. Its totient is φ = 82095120.

The previous prime is 125199973. The next prime is 125200013. The reversal of 125199999 is 999991521.

It is not a de Polignac number, because 125199999 - 2¹¹ = 125197951 is a prime.

It is a Duffinian number.

125199999 is a modest number, since divided by 99999 gives 1251 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125199959) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 7729 + ... + 17610.

It is an arithmetic number, because the mean of its divisors is an integer number (9505034).

Almost surely, 2^125199999 is an apocalyptic number.

125199999 is a deficient number, since it is larger than the sum of its proper divisors (64900681).

125199999 is an equidigital number, since it uses as much as digits as its factorization.

125199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25412 (or 25403 counting only the distinct ones).

The product of its digits is 590490, while the sum is 54.

The square root of 125199999 is about 11189.2805398739. The cubic root of 125199999 is about 500.2665232388.

The spelling of 125199999 in words is "one hundred twenty-five million, one hundred ninety-nine thousand, nine hundred ninety-nine".