43603237981 has 2 divisors, whose sum is σ = 43603237982. Its totient is φ = 43603237980.

The previous prime is 43603237973. The next prime is 43603237991. The reversal of 43603237981 is 18973230634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23916622500 + 19686615481 = 154650^2 + 140309^2 .

It is a cyclic number.

It is not a de Polignac number, because 43603237981 - 2³ = 43603237973 is a prime.

It is a super-2 number, since 2×43603237981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43603237991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21801618990 + 21801618991.

It is an arithmetic number, because the mean of its divisors is an integer number (21801618991).

Almost surely, 2^43603237981 is an apocalyptic number.

It is an amenable number.

43603237981 is a deficient number, since it is larger than the sum of its proper divisors (1).

43603237981 is an equidigital number, since it uses as much as digits as its factorization.

43603237981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 43603237981 in words is "forty-three billion, six hundred three million, two hundred thirty-seven thousand, nine hundred eighty-one".