213664543 has 4 divisors (see below), whose sum is σ = 213695800. Its totient is φ = 213633288.

The previous prime is 213664523. The next prime is 213664559. The reversal of 213664543 is 345466312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 213664543 - 2¹³ = 213656351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213664499 and 213664508.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480 + ... + 20677.

It is an arithmetic number, because the mean of its divisors is an integer number (53423950).

Almost surely, 2^213664543 is an apocalyptic number.

213664543 is a deficient number, since it is larger than the sum of its proper divisors (31257).

213664543 is a wasteful number, since it uses less digits than its factorization.

213664543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31256.

The product of its digits is 51840, while the sum is 34.

The square root of 213664543 is about 14617.2686573108. The cubic root of 213664543 is about 597.8296989356.

The spelling of 213664543 in words is "two hundred thirteen million, six hundred sixty-four thousand, five hundred forty-three".