215009 has 4 divisors (see below), whose sum is σ = 216240. Its totient is φ = 213780.

The previous prime is 214993. The next prime is 215051. The reversal of 215009 is 900512.

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 215009 - 2⁴ = 214993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215309) 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, 299 + ... + 720.

It is an arithmetic number, because the mean of its divisors is an integer number (54060).

2²¹⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

215009 is a deficient number, since it is larger than the sum of its proper divisors (1231).

215009 is a wasteful number, since it uses less digits than its factorization.

215009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 215009 is about 463.6906296228. The cubic root of 215009 is about 59.9081000526.

The spelling of 215009 in words is "two hundred fifteen thousand, nine".