216622597 has 2 divisors, whose sum is σ = 216622598. Its totient is φ = 216622596.

The previous prime is 216622583. The next prime is 216622657. The reversal of 216622597 is 795226612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126922756 + 89699841 = 11266^2 + 9471^2 .

It is a cyclic number.

It is not a de Polignac number, because 216622597 - 2²³ = 208233989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216622297) 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, 108311298 + 108311299.

It is an arithmetic number, because the mean of its divisors is an integer number (108311299).

Almost surely, 2^216622597 is an apocalyptic number.

It is an amenable number.

216622597 is a deficient number, since it is larger than the sum of its proper divisors (1).

216622597 is an equidigital number, since it uses as much as digits as its factorization.

216622597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 216622597 is about 14718.1043956075. The cubic root of 216622597 is about 600.5759257095.

The spelling of 216622597 in words is "two hundred sixteen million, six hundred twenty-two thousand, five hundred ninety-seven".