125212209 has 4 divisors (see below), whose sum is σ = 166949616. Its totient is φ = 83474804.

The previous prime is 125212201. The next prime is 125212211. The reversal of 125212209 is 902212521.

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.

It is a cyclic number.

It is not a de Polignac number, because 125212209 - 2³ = 125212201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125212201) 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, 20868699 + ... + 20868704.

It is an arithmetic number, because the mean of its divisors is an integer number (41737404).

Almost surely, 2^125212209 is an apocalyptic number.

It is an amenable number.

125212209 is a deficient number, since it is larger than the sum of its proper divisors (41737407).

125212209 is an equidigital number, since it uses as much as digits as its factorization.

125212209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41737406.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 125212209 is about 11189.8261380595. The cubic root of 125212209 is about 500.2827853681.

The spelling of 125212209 in words is "one hundred twenty-five million, two hundred twelve thousand, two hundred nine".