209031012 has 36 divisors (see below), whose sum is σ = 528893820. Its totient is φ = 69609792.

The previous prime is 209031001. The next prime is 209031013. The reversal of 209031012 is 210130902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 207532836 + 1498176 = 14406^2 + 1224^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (209031013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47314 + ... + 51542.

It is an arithmetic number, because the mean of its divisors is an integer number (14691495).

Almost surely, 2^209031012 is an apocalyptic number.

It is an amenable number.

209031012 is an abundant number, since it is smaller than the sum of its proper divisors (319862808).

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

209031012 is a wasteful number, since it uses less digits than its factorization.

209031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612 (or 5607 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 209031012 is about 14457.9048274638. The cubic root of 209031012 is about 593.4765650365.

Adding to 209031012 its reverse (210130902), we get a palindrome (419161914).

The spelling of 209031012 in words is "two hundred nine million, thirty-one thousand, twelve".