125199971 has 16 divisors (see below), whose sum is σ = 144508224. Its totient is φ = 107547264.

The previous prime is 125199959. The next prime is 125199973. The reversal of 125199971 is 179991521.

It is a de Polignac number, because none of the positive numbers 2^k-125199971 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (125199973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5405 + ... + 16721.

It is an arithmetic number, because the mean of its divisors is an integer number (9031764).

Almost surely, 2^125199971 is an apocalyptic number.

125199971 is a deficient number, since it is larger than the sum of its proper divisors (19308253).

125199971 is a wasteful number, since it uses less digits than its factorization.

125199971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11390.

The product of its digits is 51030, while the sum is 44.

The square root of 125199971 is about 11189.2792886763. The cubic root of 125199971 is about 500.2664859452.

The spelling of 125199971 in words is "one hundred twenty-five million, one hundred ninety-nine thousand, nine hundred seventy-one".