43554779197 has 2 divisors, whose sum is σ = 43554779198. Its totient is φ = 43554779196.

The previous prime is 43554779179. The next prime is 43554779227. The reversal of 43554779197 is 79197745534.

Together with previous prime (43554779179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41026097401 + 2528681796 = 202549^2 + 50286^2 .

It is a cyclic number.

It is not a de Polignac number, because 43554779197 - 2¹⁵ = 43554746429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43554759197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21777389598 + 21777389599.

It is an arithmetic number, because the mean of its divisors is an integer number (21777389599).

Almost surely, 2^43554779197 is an apocalyptic number.

It is an amenable number.

43554779197 is a deficient number, since it is larger than the sum of its proper divisors (1).

43554779197 is an equidigital number, since it uses as much as digits as its factorization.

43554779197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33339600, while the sum is 61.

The spelling of 43554779197 in words is "forty-three billion, five hundred fifty-four million, seven hundred seventy-nine thousand, one hundred ninety-seven".