213366493 has 4 divisors (see below), whose sum is σ = 213411100. Its totient is φ = 213321888.

The previous prime is 213366451. The next prime is 213366509. The reversal of 213366493 is 394663312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 99261369 + 114105124 = 9963^2 + 10682^2 .

It is a cyclic number.

It is not a de Polignac number, because 213366493 - 2⁹ = 213365981 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 (213361493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14130 + ... + 25027.

It is an arithmetic number, because the mean of its divisors is an integer number (53352775).

Almost surely, 2^213366493 is an apocalyptic number.

It is an amenable number.

213366493 is a deficient number, since it is larger than the sum of its proper divisors (44607).

213366493 is an equidigital number, since it uses as much as digits as its factorization.

213366493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44606.

The product of its digits is 69984, while the sum is 37.

The square root of 213366493 is about 14607.0699662869. The cubic root of 213366493 is about 597.5515899970.

The spelling of 213366493 in words is "two hundred thirteen million, three hundred sixty-six thousand, four hundred ninety-three".