43458781361 has 2 divisors, whose sum is σ = 43458781362. Its totient is φ = 43458781360.

The previous prime is 43458781307. The next prime is 43458781427. The reversal of 43458781361 is 16318785434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42423228961 + 1035552400 = 205969^2 + 32180^2 .

It is a cyclic number.

It is not a de Polignac number, because 43458781361 - 2⁶ = 43458781297 is a prime.

It is not a weakly prime, because it can be changed into another prime (43458751361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21729390680 + 21729390681.

It is an arithmetic number, because the mean of its divisors is an integer number (21729390681).

Almost surely, 2^43458781361 is an apocalyptic number.

It is an amenable number.

43458781361 is a deficient number, since it is larger than the sum of its proper divisors (1).

43458781361 is an equidigital number, since it uses as much as digits as its factorization.

43458781361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 50.

The spelling of 43458781361 in words is "forty-three billion, four hundred fifty-eight million, seven hundred eighty-one thousand, three hundred sixty-one".