125899891 has 4 divisors (see below), whose sum is σ = 135584512. Its totient is φ = 116215272.

The previous prime is 125899859. The next prime is 125899903. The reversal of 125899891 is 198998521.

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 125899891 - 2⁵ = 125899859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125899811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4842291 + ... + 4842316.

It is an arithmetic number, because the mean of its divisors is an integer number (33896128).

Almost surely, 2^125899891 is an apocalyptic number.

125899891 is a deficient number, since it is larger than the sum of its proper divisors (9684621).

125899891 is an equidigital number, since it uses as much as digits as its factorization.

125899891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9684620.

The product of its digits is 466560, while the sum is 52.

The square root of 125899891 is about 11220.5120649639. The cubic root of 125899891 is about 501.1969868251.

The spelling of 125899891 in words is "one hundred twenty-five million, eight hundred ninety-nine thousand, eight hundred ninety-one".