7125209 has 24 divisors (see below), whose sum is σ = 9311040. Its totient is φ = 5323968.

The previous prime is 7125203. The next prime is 7125263. The reversal of 7125209 is 9025217.

It is a de Polignac number, because none of the positive numbers 2^k-7125209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7125203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22319 + ... + 22635.

It is an arithmetic number, because the mean of its divisors is an integer number (387960).

Almost surely, 2^7125209 is an apocalyptic number.

It is an amenable number.

7125209 is a deficient number, since it is larger than the sum of its proper divisors (2185831).

7125209 is a wasteful number, since it uses less digits than its factorization.

7125209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 7125209 is about 2669.3087120077. The cubic root of 7125209 is about 192.4269380349.

The spelling of 7125209 in words is "seven million, one hundred twenty-five thousand, two hundred nine".