43865821748249 has 2 divisors, whose sum is σ = 43865821748250. Its totient is φ = 43865821748248.

The previous prime is 43865821748173. The next prime is 43865821748347. The reversal of 43865821748249 is 94284712856834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43857930091024 + 7891657225 = 6622532^2 + 88835^2 .

It is a cyclic number.

It is not a de Polignac number, because 43865821748249 - 2²⁴ = 43865804971033 is a prime.

It is not a weakly prime, because it can be changed into another prime (43865821748149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21932910874124 + 21932910874125.

It is an arithmetic number, because the mean of its divisors is an integer number (21932910874125).

Almost surely, 2^{43865821748249} is an apocalyptic number.

It is an amenable number.

43865821748249 is a deficient number, since it is larger than the sum of its proper divisors (1).

43865821748249 is an equidigital number, since it uses as much as digits as its factorization.

43865821748249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 743178240, while the sum is 71.

The spelling of 43865821748249 in words is "forty-three trillion, eight hundred sixty-five billion, eight hundred twenty-one million, seven hundred forty-eight thousand, two hundred forty-nine".