209130912 has 36 divisors (see below), whose sum is σ = 594716850. Its totient is φ = 69710208.

The previous prime is 209130907. The next prime is 209130917. The reversal of 209130912 is 219031902.

It is an interprime number because it is at equal distance from previous prime (209130907) and next prime (209130917).

It can be written as a sum of positive squares in only one way, i.e., 150700176 + 58430736 = 12276^2 + 7644^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (209130917) 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 5 ways as a sum of consecutive naturals, for example, 362787 + ... + 363362.

Almost surely, 2^209130912 is an apocalyptic number.

It is an amenable number.

209130912 is an abundant number, since it is smaller than the sum of its proper divisors (385585938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209130912 is a wasteful number, since it uses less digits than its factorization.

209130912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726165 (or 726154 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 209130912 is about 14461.3592722123. The cubic root of 209130912 is about 593.5710946564.

The spelling of 209130912 in words is "two hundred nine million, one hundred thirty thousand, nine hundred twelve".