43536781 has 2 divisors, whose sum is σ = 43536782. Its totient is φ = 43536780.

The previous prime is 43536767. The next prime is 43536833. The reversal of 43536781 is 18763534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39576681 + 3960100 = 6291^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 43536781 - 2⁷ = 43536653 is a prime.

It is a super-2 number, since 2×43536781² = 3790902599683922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43536781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43536721) 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, 21768390 + 21768391.

It is an arithmetic number, because the mean of its divisors is an integer number (21768391).

Almost surely, 2^43536781 is an apocalyptic number.

It is an amenable number.

43536781 is a deficient number, since it is larger than the sum of its proper divisors (1).

43536781 is an equidigital number, since it uses as much as digits as its factorization.

43536781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 37.

The square root of 43536781 is about 6598.2407503819. The cubic root of 43536781 is about 351.7915782563.

The spelling of 43536781 in words is "forty-three million, five hundred thirty-six thousand, seven hundred eighty-one".