215189 has 4 divisors (see below), whose sum is σ = 231756. Its totient is φ = 198624.

The previous prime is 215183. The next prime is 215191. The reversal of 215189 is 981512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 128164 + 87025 = 358^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 215189 - 2¹² = 211093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8264 + ... + 8289.

It is an arithmetic number, because the mean of its divisors is an integer number (57939).

2²¹⁵¹⁸⁹ is an apocalyptic number.

It is an amenable number.

215189 is a deficient number, since it is larger than the sum of its proper divisors (16567).

215189 is a wasteful number, since it uses less digits than its factorization.

215189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16566.

The product of its digits is 720, while the sum is 26.

The square root of 215189 is about 463.8846839463. The cubic root of 215189 is about 59.9248132293.

It can be divided in two parts, 215 and 189, that added together give a palindrome (404).

The spelling of 215189 in words is "two hundred fifteen thousand, one hundred eighty-nine".