213556823 has 8 divisors (see below), whose sum is σ = 218986656. Its totient is φ = 208137600.

The previous prime is 213556807. The next prime is 213556831. The reversal of 213556823 is 328655312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213556823 - 2⁴ = 213556807 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 (213556883) 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 7 ways as a sum of consecutive naturals, for example, 52190 + ... + 56132.

It is an arithmetic number, because the mean of its divisors is an integer number (27373332).

Almost surely, 2^213556823 is an apocalyptic number.

213556823 is a deficient number, since it is larger than the sum of its proper divisors (5429833).

213556823 is a wasteful number, since it uses less digits than its factorization.

213556823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305.

The product of its digits is 43200, while the sum is 35.

The square root of 213556823 is about 14613.5835098719. The cubic root of 213556823 is about 597.7292158146.

The spelling of 213556823 in words is "two hundred thirteen million, five hundred fifty-six thousand, eight hundred twenty-three".