125045209 has 4 divisors (see below), whose sum is σ = 125107380. Its totient is φ = 124983040.

The previous prime is 125045201. The next prime is 125045233. The reversal of 125045209 is 902540521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97713225 + 27331984 = 9885^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 125045209 - 2³ = 125045201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125045201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27964 + ... + 32125.

It is an arithmetic number, because the mean of its divisors is an integer number (31276845).

Almost surely, 2^125045209 is an apocalyptic number.

It is an amenable number.

125045209 is a deficient number, since it is larger than the sum of its proper divisors (62171).

125045209 is an equidigital number, since it uses as much as digits as its factorization.

125045209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62170.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 125045209 is about 11182.3615126681. The cubic root of 125045209 is about 500.0602714011.

The spelling of 125045209 in words is "one hundred twenty-five million, forty-five thousand, two hundred nine".