209033213 has 4 divisors (see below), whose sum is σ = 209112540. Its totient is φ = 208953888.

The previous prime is 209033183. The next prime is 209033249. The reversal of 209033213 is 312330902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 197486809 + 11546404 = 14053^2 + 3398^2 .

It is a cyclic number.

It is not a de Polignac number, because 209033213 - 2¹⁶ = 208967677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209033813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35570 + ... + 41027.

It is an arithmetic number, because the mean of its divisors is an integer number (52278135).

Almost surely, 2^209033213 is an apocalyptic number.

It is an amenable number.

209033213 is a deficient number, since it is larger than the sum of its proper divisors (79327).

209033213 is an equidigital number, since it uses as much as digits as its factorization.

209033213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79326.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 209033213 is about 14457.9809447931. The cubic root of 209033213 is about 593.4786480405.

The spelling of 209033213 in words is "two hundred nine million, thirty-three thousand, two hundred thirteen".