43889091797 has 2 divisors, whose sum is σ = 43889091798. Its totient is φ = 43889091796.

The previous prime is 43889091791. The next prime is 43889091817. The reversal of 43889091797 is 79719098834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34047261361 + 9841830436 = 184519^2 + 99206^2 .

It is a cyclic number.

It is not a de Polignac number, because 43889091797 - 2²⁴ = 43872314581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43889091791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21944545898 + 21944545899.

It is an arithmetic number, because the mean of its divisors is an integer number (21944545899).

Almost surely, 2^43889091797 is an apocalyptic number.

It is an amenable number.

43889091797 is a deficient number, since it is larger than the sum of its proper divisors (1).

43889091797 is an equidigital number, since it uses as much as digits as its factorization.

43889091797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 65.

The spelling of 43889091797 in words is "forty-three billion, eight hundred eighty-nine million, ninety-one thousand, seven hundred ninety-seven".