216179489 has 2 divisors, whose sum is σ = 216179490. Its totient is φ = 216179488.

The previous prime is 216179477. The next prime is 216179503. The reversal of 216179489 is 984971612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164224225 + 51955264 = 12815^2 + 7208^2 .

It is a cyclic number.

It is not a de Polignac number, because 216179489 - 2⁸ = 216179233 is a prime.

It is a super-2 number, since 2×216179489² = 93467142928602242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216170489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108089744 + 108089745.

It is an arithmetic number, because the mean of its divisors is an integer number (108089745).

Almost surely, 2^216179489 is an apocalyptic number.

It is an amenable number.

216179489 is a deficient number, since it is larger than the sum of its proper divisors (1).

216179489 is an equidigital number, since it uses as much as digits as its factorization.

216179489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 216179489 is about 14703.0435284672. The cubic root of 216179489 is about 600.1661475059.

The spelling of 216179489 in words is "two hundred sixteen million, one hundred seventy-nine thousand, four hundred eighty-nine".