213189865 has 16 divisors (see below), whose sum is σ = 292860288. Its totient is φ = 145944576.

The previous prime is 213189859. The next prime is 213189869. The reversal of 213189865 is 568981312.

It is a cyclic number.

It is not a de Polignac number, because 213189865 - 2¹⁵ = 213157097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213189869) 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, 17769 + ... + 27241.

It is an arithmetic number, because the mean of its divisors is an integer number (18303768).

Almost surely, 2^213189865 is an apocalyptic number.

It is an amenable number.

213189865 is a deficient number, since it is larger than the sum of its proper divisors (79670423).

213189865 is an equidigital number, since it uses as much as digits as its factorization.

213189865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10128.

The product of its digits is 103680, while the sum is 43.

The square root of 213189865 is about 14601.0227381509. The cubic root of 213189865 is about 597.3866570720.

The spelling of 213189865 in words is "two hundred thirteen million, one hundred eighty-nine thousand, eight hundred sixty-five".