215109 has 16 divisors (see below), whose sum is σ = 330240. Its totient is φ = 138240.

The previous prime is 215087. The next prime is 215123. The reversal of 215109 is 901512.

It is not a de Polignac number, because 215109 - 2⁵ = 215077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215091 and 215100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215179) 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 15 ways as a sum of consecutive naturals, for example, 709 + ... + 965.

It is an arithmetic number, because the mean of its divisors is an integer number (20640).

2²¹⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

215109 is a deficient number, since it is larger than the sum of its proper divisors (115131).

215109 is a wasteful number, since it uses less digits than its factorization.

215109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 215109 is about 463.7984476041. The cubic root of 215109 is about 59.9173863018.

It can be divided in two parts, 215 and 109, that added together give a square (324 = 18²).

The spelling of 215109 in words is "two hundred fifteen thousand, one hundred nine".