215122165 has 16 divisors (see below), whose sum is σ = 274399488. Its totient is φ = 161341696.

The previous prime is 215122157. The next prime is 215122169. The reversal of 215122165 is 561221512.

It is not a de Polignac number, because 215122165 - 2³ = 215122157 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 (215122169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17544 + ... + 27166.

It is an arithmetic number, because the mean of its divisors is an integer number (17149968).

Almost surely, 2^215122165 is an apocalyptic number.

It is an amenable number.

215122165 is a deficient number, since it is larger than the sum of its proper divisors (59277323).

215122165 is a wasteful number, since it uses less digits than its factorization.

215122165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9908.

The product of its digits is 1200, while the sum is 25.

The square root of 215122165 is about 14667.0434989469. The cubic root of 215122165 is about 599.1860862213.

Adding to 215122165 its reverse (561221512), we get a palindrome (776343677).

The spelling of 215122165 in words is "two hundred fifteen million, one hundred twenty-two thousand, one hundred sixty-five".