43213381 has 2 divisors, whose sum is σ = 43213382. Its totient is φ = 43213380.

The previous prime is 43213367. The next prime is 43213397. The reversal of 43213381 is 18331234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41809156 + 1404225 = 6466^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 43213381 - 2⁷ = 43213253 is a prime.

It is a super-2 number, since 2×43213381² = 3734792594902322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43213301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21606690 + 21606691.

It is an arithmetic number, because the mean of its divisors is an integer number (21606691).

Almost surely, 2^43213381 is an apocalyptic number.

It is an amenable number.

43213381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43213381 is an equidigital number, since it uses as much as digits as its factorization.

43213381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 25.

The square root of 43213381 is about 6573.6885384083. The cubic root of 43213381 is about 350.9183528840.

The spelling of 43213381 in words is "forty-three million, two hundred thirteen thousand, three hundred eighty-one".