213664511 has 4 divisors (see below), whose sum is σ = 213962400. Its totient is φ = 213366624.

The previous prime is 213664499. The next prime is 213664513. The reversal of 213664511 is 115466312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213664511 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 (213664513) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 147866 + ... + 149303.

It is an arithmetic number, because the mean of its divisors is an integer number (53490600).

Almost surely, 2^213664511 is an apocalyptic number.

213664511 is a deficient number, since it is larger than the sum of its proper divisors (297889).

213664511 is an equidigital number, since it uses as much as digits as its factorization.

213664511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297888.

The product of its digits is 4320, while the sum is 29.

The square root of 213664511 is about 14617.2675627150. The cubic root of 213664511 is about 597.8296690905.

The spelling of 213664511 in words is "two hundred thirteen million, six hundred sixty-four thousand, five hundred eleven".