219116591 has 2 divisors, whose sum is σ = 219116592. Its totient is φ = 219116590.

The previous prime is 219116551. The next prime is 219116641. The reversal of 219116591 is 195611912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-219116591 is a prime.

It is a super-2 number, since 2×219116591² = 96024160902922562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219116551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109558295 + 109558296.

It is an arithmetic number, because the mean of its divisors is an integer number (109558296).

Almost surely, 2^219116591 is an apocalyptic number.

219116591 is a deficient number, since it is larger than the sum of its proper divisors (1).

219116591 is an equidigital number, since it uses as much as digits as its factorization.

219116591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 35.

The square root of 219116591 is about 14802.5873076297. The cubic root of 219116591 is about 602.8719635163.

The spelling of 219116591 in words is "two hundred nineteen million, one hundred sixteen thousand, five hundred ninety-one".