213644165 has 12 divisors (see below), whose sum is σ = 298230156. Its totient is φ = 146498688.

The previous prime is 213644159. The next prime is 213644177. The reversal of 213644165 is 561446312.

It can be written as a sum of positive squares in 2 ways, for example, as 46485124 + 167159041 = 6818^2 + 12929^2 .

It is not a de Polignac number, because 213644165 - 2¹⁴ = 213627781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435764 + ... + 436253.

It is an arithmetic number, because the mean of its divisors is an integer number (24852513).

Almost surely, 2^213644165 is an apocalyptic number.

It is an amenable number.

213644165 is a deficient number, since it is larger than the sum of its proper divisors (84585991).

213644165 is an equidigital number, since it uses as much as digits as its factorization.

213644165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872036 (or 872029 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 213644165 is about 14616.5715884403. The cubic root of 213644165 is about 597.8106925674.

The spelling of 213644165 in words is "two hundred thirteen million, six hundred forty-four thousand, one hundred sixty-five".