43681037 has 2 divisors, whose sum is σ = 43681038. Its totient is φ = 43681036.

The previous prime is 43681013. The next prime is 43681039. The reversal of 43681037 is 73018634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41203561 + 2477476 = 6419^2 + 1574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43681037 is a prime.

Together with 43681039, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 43680994 and 43681012.

It is a congruent number.

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, 21840518 + 21840519.

It is an arithmetic number, because the mean of its divisors is an integer number (21840519).

Almost surely, 2^43681037 is an apocalyptic number.

It is an amenable number.

43681037 is a deficient number, since it is larger than the sum of its proper divisors (1).

43681037 is an equidigital number, since it uses as much as digits as its factorization.

43681037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 43681037 is about 6609.1631088966. The cubic root of 43681037 is about 352.1796952897.

The spelling of 43681037 in words is "forty-three million, six hundred eighty-one thousand, thirty-seven".