215089 has 4 divisors (see below), whose sum is σ = 245824. Its totient is φ = 184356.

The previous prime is 215087. The next prime is 215123. The reversal of 215089 is 980512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215089 - 2¹ = 215087 is a prime.

It is a Duffinian number.

215089 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (215087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15357 + ... + 15370.

It is an arithmetic number, because the mean of its divisors is an integer number (61456).

2²¹⁵⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

215089 is a deficient number, since it is larger than the sum of its proper divisors (30735).

215089 is an equidigital number, since it uses as much as digits as its factorization.

215089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30734.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 215089 is about 463.7768860131. The cubic root of 215089 is about 59.9155292823.

Subtracting from 215089 its product of nonzero digits (720), we obtain a square (214369 = 463²).

The spelling of 215089 in words is "two hundred fifteen thousand, eighty-nine".