125430209 has 2 divisors, whose sum is σ = 125430210. Its totient is φ = 125430208.

The previous prime is 125430203. The next prime is 125430241. The reversal of 125430209 is 902034521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116035984 + 9394225 = 10772^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 125430209 - 2²⁰ = 124381633 is a prime.

It is a Chen prime.

It is equal to p_7133246 and since 125430209 and 7133246 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (125430203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62715104 + 62715105.

It is an arithmetic number, because the mean of its divisors is an integer number (62715105).

Almost surely, 2^125430209 is an apocalyptic number.

It is an amenable number.

125430209 is a deficient number, since it is larger than the sum of its proper divisors (1).

125430209 is an equidigital number, since it uses as much as digits as its factorization.

125430209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 125430209 is about 11199.5628932561. The cubic root of 125430209 is about 500.5729551939.

The spelling of 125430209 in words is "one hundred twenty-five million, four hundred thirty thousand, two hundred nine".