213140209 has 2 divisors, whose sum is σ = 213140210. Its totient is φ = 213140208.

The previous prime is 213140177. The next prime is 213140219. The reversal of 213140209 is 902041312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191545600 + 21594609 = 13840^2 + 4647^2 .

It is a cyclic number.

It is not a de Polignac number, because 213140209 - 2⁵ = 213140177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213140209.

It is not a weakly prime, because it can be changed into another prime (213140219) 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 as a sum of consecutive naturals, namely, 106570104 + 106570105.

It is an arithmetic number, because the mean of its divisors is an integer number (106570105).

Almost surely, 2^213140209 is an apocalyptic number.

It is an amenable number.

213140209 is a deficient number, since it is larger than the sum of its proper divisors (1).

213140209 is an equidigital number, since it uses as much as digits as its factorization.

213140209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 213140209 is about 14599.3222102946. The cubic root of 213140209 is about 597.3402725417.

The spelling of 213140209 in words is "two hundred thirteen million, one hundred forty thousand, two hundred nine".