43681049 has 2 divisors, whose sum is σ = 43681050. Its totient is φ = 43681048.

The previous prime is 43681039. The next prime is 43681051. The reversal of 43681049 is 94018634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33235225 + 10445824 = 5765^2 + 3232^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43681049 is a prime.

Together with 43681051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43681039) 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, 21840524 + 21840525.

It is an arithmetic number, because the mean of its divisors is an integer number (21840525).

Almost surely, 2^43681049 is an apocalyptic number.

It is an amenable number.

43681049 is a deficient number, since it is larger than the sum of its proper divisors (1).

43681049 is an equidigital number, since it uses as much as digits as its factorization.

43681049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 43681049 is about 6609.1640167271. The cubic root of 43681049 is about 352.1797275399.

The spelling of 43681049 in words is "forty-three million, six hundred eighty-one thousand, forty-nine".