43306381 has 2 divisors, whose sum is σ = 43306382. Its totient is φ = 43306380.

The previous prime is 43306271. The next prime is 43306399. The reversal of 43306381 is 18360334.

43306381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35212356 + 8094025 = 5934^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 43306381 - 2⁷ = 43306253 is a prime.

It is a super-2 number, since 2×43306381² = 3750885270634322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43366381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21653190 + 21653191.

It is an arithmetic number, because the mean of its divisors is an integer number (21653191).

Almost surely, 2^43306381 is an apocalyptic number.

It is an amenable number.

43306381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43306381 is an equidigital number, since it uses as much as digits as its factorization.

43306381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 43306381 is about 6580.7583909455. The cubic root of 43306381 is about 351.1699109457.

The spelling of 43306381 in words is "forty-three million, three hundred six thousand, three hundred eighty-one".