125639123 has 4 divisors (see below), whose sum is σ = 126103008. Its totient is φ = 125175240.

The previous prime is 125639119. The next prime is 125639141. The reversal of 125639123 is 321936521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321936521 = 4111 ⋅78311.

It is a cyclic number.

It is not a de Polignac number, because 125639123 - 2² = 125639119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125639123.

It is not an unprimeable number, because it can be changed into a prime (125639113) 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, 231536 + ... + 232077.

It is an arithmetic number, because the mean of its divisors is an integer number (31525752).

Almost surely, 2^125639123 is an apocalyptic number.

125639123 is a deficient number, since it is larger than the sum of its proper divisors (463885).

125639123 is an equidigital number, since it uses as much as digits as its factorization.

125639123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463884.

The product of its digits is 9720, while the sum is 32.

The square root of 125639123 is about 11208.8858946820. The cubic root of 125639123 is about 500.8507157445.

The spelling of 125639123 in words is "one hundred twenty-five million, six hundred thirty-nine thousand, one hundred twenty-three".