216590089 has 3 divisors (see below), whose sum is σ = 216604807. Its totient is φ = 216575372.

The previous prime is 216590083. The next prime is 216590093. The reversal of 216590089 is 980095612.

The square root of 216590089 is 14717.

It is a perfect power (a square), and thus also a powerful number.

216590089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 60140025 + 156450064 = 7755^2 + 12508^2 .

It is a de Polignac number, because none of the positive numbers 2^k-216590089 is a prime.

It is a super-2 number, since 2×216590089² = 93822533306055842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216590083) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7359 + ... + 22075.

Almost surely, 2^216590089 is an apocalyptic number.

216590089 is the 14717-th square number.

216590089 is the 7359-th centered octagonal number.

It is an amenable number.

216590089 is a deficient number, since it is larger than the sum of its proper divisors (14718).

216590089 is an frugal number, since it uses more digits than its factorization.

216590089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29434 (or 14717 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The cubic root of 216590089 is about 600.5458819080.

The spelling of 216590089 in words is "two hundred sixteen million, five hundred ninety thousand, eighty-nine".