215129 has 4 divisors (see below), whose sum is σ = 220176. Its totient is φ = 210084.

The previous prime is 215123. The next prime is 215141. The reversal of 215129 is 921512.

215129 is nontrivially palindromic in base 14.

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 a de Polignac number, because none of the positive numbers 2^k-215129 is a prime.

It is a Duffinian number.

215129 is an undulating number in base 14.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215129.

It is not an unprimeable number, because it can be changed into a prime (215123) 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, 2459 + ... + 2544.

It is an arithmetic number, because the mean of its divisors is an integer number (55044).

2²¹⁵¹²⁹ is an apocalyptic number.

It is an amenable number.

215129 is a deficient number, since it is larger than the sum of its proper divisors (5047).

215129 is an equidigital number, since it uses as much as digits as its factorization.

215129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5046.

The product of its digits is 180, while the sum is 20.

The square root of 215129 is about 463.8200081928. The cubic root of 215129 is about 59.9192432063.

The spelling of 215129 in words is "two hundred fifteen thousand, one hundred twenty-nine".