209151189 has 36 divisors (see below), whose sum is σ = 329253600. Its totient is φ = 127876320.

The previous prime is 209151181. The next prime is 209151191. The reversal of 209151189 is 981151902.

It is not a de Polignac number, because 209151189 - 2³ = 209151181 is a prime.

It is a super-2 number, since 2×209151189² = 87488439720227442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209151181) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 302334 + ... + 303024.

Almost surely, 2^209151189 is an apocalyptic number.

It is an amenable number.

209151189 is a deficient number, since it is larger than the sum of its proper divisors (120102411).

209151189 is a wasteful number, since it uses less digits than its factorization.

209151189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 209151189 is about 14462.0603303955. The cubic root of 209151189 is about 593.5902779389.

The spelling of 209151189 in words is "two hundred nine million, one hundred fifty-one thousand, one hundred eighty-nine".