125418209 has 4 divisors (see below), whose sum is σ = 143335104. Its totient is φ = 107501316.

The previous prime is 125418203. The next prime is 125418211. The reversal of 125418209 is 902814521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902814521 = 7 ⋅128973503.

It is a cyclic number.

It is not a de Polignac number, because 125418209 - 2²⁰ = 124369633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125418203) 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, 8958437 + ... + 8958450.

It is an arithmetic number, because the mean of its divisors is an integer number (35833776).

Almost surely, 2^125418209 is an apocalyptic number.

It is an amenable number.

125418209 is a deficient number, since it is larger than the sum of its proper divisors (17916895).

125418209 is an equidigital number, since it uses as much as digits as its factorization.

125418209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17916894.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 125418209 is about 11199.0271452479. The cubic root of 125418209 is about 500.5569912910.

The spelling of 125418209 in words is "one hundred twenty-five million, four hundred eighteen thousand, two hundred nine".