216813607 has 2 divisors, whose sum is σ = 216813608. Its totient is φ = 216813606.

The previous prime is 216813601. The next prime is 216813647. The reversal of 216813607 is 706318612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216813607 - 2²⁷ = 82595879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216813601) 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, 108406803 + 108406804.

It is an arithmetic number, because the mean of its divisors is an integer number (108406804).

Almost surely, 2^216813607 is an apocalyptic number.

216813607 is a deficient number, since it is larger than the sum of its proper divisors (1).

216813607 is an equidigital number, since it uses as much as digits as its factorization.

216813607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 216813607 is about 14724.5919128511. The cubic root of 216813607 is about 600.7523959211.

The spelling of 216813607 in words is "two hundred sixteen million, eight hundred thirteen thousand, six hundred seven".