43981087 has 2 divisors, whose sum is σ = 43981088. Its totient is φ = 43981086.

The previous prime is 43981079. The next prime is 43981111. The reversal of 43981087 is 78018934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43981087 - 2³ = 43981079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43981027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21990543 + 21990544.

It is an arithmetic number, because the mean of its divisors is an integer number (21990544).

Almost surely, 2^43981087 is an apocalyptic number.

43981087 is a deficient number, since it is larger than the sum of its proper divisors (1).

43981087 is an equidigital number, since it uses as much as digits as its factorization.

43981087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 43981087 is about 6631.8238064653. The cubic root of 43981087 is about 352.9842433454.

The spelling of 43981087 in words is "forty-three million, nine hundred eighty-one thousand, eighty-seven".