209528612 has 6 divisors (see below), whose sum is σ = 366675078. Its totient is φ = 104764304.

The previous prime is 209528611. The next prime is 209528639. The reversal of 209528612 is 216825902.

It is a happy number.

209528612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 123298816 + 86229796 = 11104^2 + 9286^2 .

It is not an unprimeable number, because it can be changed into a prime (209528611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26191073 + ... + 26191080.

It is an arithmetic number, because the mean of its divisors is an integer number (61112513).

Almost surely, 2^209528612 is an apocalyptic number.

It is an amenable number.

209528612 is a deficient number, since it is larger than the sum of its proper divisors (157146466).

209528612 is a wasteful number, since it uses less digits than its factorization.

209528612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52382157 (or 52382155 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 209528612 is about 14475.1031775252. The cubic root of 209528612 is about 593.9471170899.

The spelling of 209528612 in words is "two hundred nine million, five hundred twenty-eight thousand, six hundred twelve".