215590489 has 3 divisors (see below), whose sum is σ = 215605173. Its totient is φ = 215575806.

The previous prime is 215590451. The next prime is 215590541. The reversal of 215590489 is 984095512.

The square root of 215590489 is 14683.

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

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 is not a de Polignac number, because 215590489 - 2¹⁵ = 215557721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215590429) 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, 7342 + ... + 22024.

It is an arithmetic number, because the mean of its divisors is an integer number (71868391).

Almost surely, 2^215590489 is an apocalyptic number.

215590489 is the 14683-rd square number.

215590489 is the 7342-nd centered octagonal number.

It is an amenable number.

215590489 is a deficient number, since it is larger than the sum of its proper divisors (14684).

215590489 is an frugal number, since it uses more digits than its factorization.

215590489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29366 (or 14683 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 43.

The cubic root of 215590489 is about 599.6205832703.

Multiplying 215590489 by its product of nonzero digits (129600), we get a square (27940527374400 = 5285880²).

The spelling of 215590489 in words is "two hundred fifteen million, five hundred ninety thousand, four hundred eighty-nine".