213607949509 has 2 divisors, whose sum is σ = 213607949510. Its totient is φ = 213607949508.

The previous prime is 213607949501. The next prime is 213607949557. The reversal of 213607949509 is 905949706312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196495385284 + 17112564225 = 443278^2 + 130815^2 .

It is a cyclic number.

It is not a de Polignac number, because 213607949509 - 2³ = 213607949501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213607949509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213607949501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106803974754 + 106803974755.

It is an arithmetic number, because the mean of its divisors is an integer number (106803974755).

Almost surely, 2^213607949509 is an apocalyptic number.

It is an amenable number.

213607949509 is a deficient number, since it is larger than the sum of its proper divisors (1).

213607949509 is an equidigital number, since it uses as much as digits as its factorization.

213607949509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 213607949509 in words is "two hundred thirteen billion, six hundred seven million, nine hundred forty-nine thousand, five hundred nine".