43819381 has 2 divisors, whose sum is σ = 43819382. Its totient is φ = 43819380.

The previous prime is 43819361. The next prime is 43819397. The reversal of 43819381 is 18391834.

43819381 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., 43164900 + 654481 = 6570^2 + 809^2 .

It is a cyclic number.

It is not a de Polignac number, because 43819381 - 2¹⁹ = 43295093 is a prime.

It is a super-2 number, since 2×43819381² = 3840276302446322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43819381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43819361) 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, 21909690 + 21909691.

It is an arithmetic number, because the mean of its divisors is an integer number (21909691).

Almost surely, 2^43819381 is an apocalyptic number.

It is an amenable number.

43819381 is a deficient number, since it is larger than the sum of its proper divisors (1).

43819381 is an equidigital number, since it uses as much as digits as its factorization.

43819381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 43819381 is about 6619.6209105960. The cubic root of 43819381 is about 352.5511043725.

The spelling of 43819381 in words is "forty-three million, eight hundred nineteen thousand, three hundred eighty-one".