216393713 has 2 divisors, whose sum is σ = 216393714. Its totient is φ = 216393712.

The previous prime is 216393643. The next prime is 216393739. The reversal of 216393713 is 317393612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152201569 + 64192144 = 12337^2 + 8012^2 .

It is a cyclic number.

It is not a de Polignac number, because 216393713 - 2¹⁰ = 216392689 is a prime.

It is not a weakly prime, because it can be changed into another prime (216393773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108196856 + 108196857.

It is an arithmetic number, because the mean of its divisors is an integer number (108196857).

Almost surely, 2^216393713 is an apocalyptic number.

It is an amenable number.

216393713 is a deficient number, since it is larger than the sum of its proper divisors (1).

216393713 is an equidigital number, since it uses as much as digits as its factorization.

216393713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 35.

The square root of 216393713 is about 14710.3267468809. The cubic root of 216393713 is about 600.3643278047.

It can be divided in two parts, 21639 and 3713, that added together give a palindrome (25352).

The spelling of 216393713 in words is "two hundred sixteen million, three hundred ninety-three thousand, seven hundred thirteen".