125749971 has 12 divisors (see below), whose sum is σ = 182966472. Its totient is φ = 83220576.

The previous prime is 125749951. The next prime is 125749979. The reversal of 125749971 is 179947521.

125749971 is a `hidden beast` number, since 1 + 2 + 574 + 9 + 9 + 71 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-125749971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125749979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49761 + ... + 52226.

It is an arithmetic number, because the mean of its divisors is an integer number (15247206).

Almost surely, 2^125749971 is an apocalyptic number.

125749971 is a deficient number, since it is larger than the sum of its proper divisors (57216501).

125749971 is a wasteful number, since it uses less digits than its factorization.

125749971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102130 (or 102127 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 125749971 is about 11213.8294529567. The cubic root of 125749971 is about 500.9979681273.

The spelling of 125749971 in words is "one hundred twenty-five million, seven hundred forty-nine thousand, nine hundred seventy-one".