43997481973 has 2 divisors, whose sum is σ = 43997481974. Its totient is φ = 43997481972.

The previous prime is 43997481961. The next prime is 43997482013. The reversal of 43997481973 is 37918479934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42730264369 + 1267217604 = 206713^2 + 35598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43997481973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43997481923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21998740986 + 21998740987.

It is an arithmetic number, because the mean of its divisors is an integer number (21998740987).

Almost surely, 2^43997481973 is an apocalyptic number.

It is an amenable number.

43997481973 is a deficient number, since it is larger than the sum of its proper divisors (1).

43997481973 is an equidigital number, since it uses as much as digits as its factorization.

43997481973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41150592, while the sum is 64.

The spelling of 43997481973 in words is "forty-three billion, nine hundred ninety-seven million, four hundred eighty-one thousand, nine hundred seventy-three".