125426209 has 2 divisors, whose sum is σ = 125426210. Its totient is φ = 125426208.

The previous prime is 125426183. The next prime is 125426219. The reversal of 125426209 is 902624521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115089984 + 10336225 = 10728^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 125426209 - 2⁵ = 125426177 is a prime.

It is a super-2 number, since 2×125426209² = 31463467808223362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (125426219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62713104 + 62713105.

It is an arithmetic number, because the mean of its divisors is an integer number (62713105).

Almost surely, 2^125426209 is an apocalyptic number.

It is an amenable number.

125426209 is a deficient number, since it is larger than the sum of its proper divisors (1).

125426209 is an equidigital number, since it uses as much as digits as its factorization.

125426209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 125426209 is about 11199.3843134344. The cubic root of 125426209 is about 500.5676340061.

The spelling of 125426209 in words is "one hundred twenty-five million, four hundred twenty-six thousand, two hundred nine".