209125189 has 24 divisors (see below), whose sum is σ = 263292120. Its totient is φ = 164634624.

The previous prime is 209125183. The next prime is 209125193. The reversal of 209125189 is 981521902.

It can be written as a sum of positive squares in 4 ways, for example, as 17994564 + 191130625 = 4242^2 + 13825^2 .

It is not a de Polignac number, because 209125189 - 2³ = 209125181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209125181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147717 + ... + 149125.

It is an arithmetic number, because the mean of its divisors is an integer number (10970505).

Almost surely, 2^209125189 is an apocalyptic number.

It is an amenable number.

209125189 is a deficient number, since it is larger than the sum of its proper divisors (54166931).

209125189 is a wasteful number, since it uses less digits than its factorization.

209125189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669 (or 1662 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 209125189 is about 14461.1613987259. The cubic root of 209125189 is about 593.5656801239.

The spelling of 209125189 in words is "two hundred nine million, one hundred twenty-five thousand, one hundred eighty-nine".