216164489 has 2 divisors, whose sum is σ = 216164490. Its totient is φ = 216164488.

The previous prime is 216164467. The next prime is 216164497. The reversal of 216164489 is 984461612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208369225 + 7795264 = 14435^2 + 2792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216164489 is a prime.

It is a super-2 number, since 2×216164489² = 93454172609262242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216164449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108082244 + 108082245.

It is an arithmetic number, because the mean of its divisors is an integer number (108082245).

Almost surely, 2^216164489 is an apocalyptic number.

It is an amenable number.

216164489 is a deficient number, since it is larger than the sum of its proper divisors (1).

216164489 is an equidigital number, since it uses as much as digits as its factorization.

216164489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 216164489 is about 14702.5334211489. The cubic root of 216164489 is about 600.1522659848.

The spelling of 216164489 in words is "two hundred sixteen million, one hundred sixty-four thousand, four hundred eighty-nine".