213324731 has 4 divisors (see below), whose sum is σ = 213640512. Its totient is φ = 213008952.

The previous prime is 213324719. The next prime is 213324737. The reversal of 213324731 is 137423312.

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

It is a cyclic number.

It is not a de Polignac number, because 213324731 - 2¹⁰ = 213323707 is a prime.

It is a super-2 number, since 2×213324731² = 91014881712444722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213324731.

It is not an unprimeable number, because it can be changed into a prime (213324737) 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, 156875 + ... + 158228.

It is an arithmetic number, because the mean of its divisors is an integer number (53410128).

Almost surely, 2^213324731 is an apocalyptic number.

213324731 is a deficient number, since it is larger than the sum of its proper divisors (315781).

213324731 is an equidigital number, since it uses as much as digits as its factorization.

213324731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315780.

The product of its digits is 3024, while the sum is 26.

The square root of 213324731 is about 14605.6403830849. The cubic root of 213324731 is about 597.5126014044.

The spelling of 213324731 in words is "two hundred thirteen million, three hundred twenty-four thousand, seven hundred thirty-one".