125125439 has 4 divisors (see below), whose sum is σ = 125480256. Its totient is φ = 124770624.

The previous prime is 125125433. The next prime is 125125447. The reversal of 125125439 is 934521521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934521521 = 6047 ⋅154543.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125125439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125125433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176879 + ... + 177584.

It is an arithmetic number, because the mean of its divisors is an integer number (31370064).

Almost surely, 2^125125439 is an apocalyptic number.

125125439 is a deficient number, since it is larger than the sum of its proper divisors (354817).

125125439 is an equidigital number, since it uses as much as digits as its factorization.

125125439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354816.

The product of its digits is 10800, while the sum is 32.

The square root of 125125439 is about 11185.9482834492. The cubic root of 125125439 is about 500.1671960847.

The spelling of 125125439 in words is "one hundred twenty-five million, one hundred twenty-five thousand, four hundred thirty-nine".