213617716309 has 2 divisors, whose sum is σ = 213617716310. Its totient is φ = 213617716308.

The previous prime is 213617716283. The next prime is 213617716327. The reversal of 213617716309 is 903617716312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138163120209 + 75454596100 = 371703^2 + 274690^2 .

It is a cyclic number.

It is not a de Polignac number, because 213617716309 - 2¹⁵ = 213617683541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213617716709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106808858154 + 106808858155.

It is an arithmetic number, because the mean of its divisors is an integer number (106808858155).

Almost surely, 2^213617716309 is an apocalyptic number.

It is an amenable number.

213617716309 is a deficient number, since it is larger than the sum of its proper divisors (1).

213617716309 is an equidigital number, since it uses as much as digits as its factorization.

213617716309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 46.

The spelling of 213617716309 in words is "two hundred thirteen billion, six hundred seventeen million, seven hundred sixteen thousand, three hundred nine".