215145 has 24 divisors (see below), whose sum is σ = 426816. Its totient is φ = 98208.

The previous prime is 215143. The next prime is 215153. The reversal of 215145 is 541512.

It is not a de Polignac number, because 215145 - 2¹ = 215143 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 215145.

It is not an unprimeable number, because it can be changed into a prime (215141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27 + ... + 656.

It is an arithmetic number, because the mean of its divisors is an integer number (17784).

2²¹⁵¹⁴⁵ is an apocalyptic number.

It is an amenable number.

215145 is a deficient number, since it is larger than the sum of its proper divisors (211671).

215145 is a wasteful number, since it uses less digits than its factorization.

215145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 698 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 215145 is about 463.8372559422. The cubic root of 215145 is about 59.9207286470.

Adding to 215145 its reverse (541512), we get a palindrome (756657).

The spelling of 215145 in words is "two hundred fifteen thousand, one hundred forty-five".