43081639 has 2 divisors, whose sum is σ = 43081640. Its totient is φ = 43081638.

The previous prime is 43081637. The next prime is 43081663. The reversal of 43081639 is 93618034.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43081639 - 2¹ = 43081637 is a prime.

Together with 43081637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43081631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21540819 + 21540820.

It is an arithmetic number, because the mean of its divisors is an integer number (21540820).

Almost surely, 2^43081639 is an apocalyptic number.

43081639 is a deficient number, since it is larger than the sum of its proper divisors (1).

43081639 is an equidigital number, since it uses as much as digits as its factorization.

43081639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 43081639 is about 6563.6604878680. The cubic root of 43081639 is about 350.5613820837.

The spelling of 43081639 in words is "forty-three million, eighty-one thousand, six hundred thirty-nine".