43194459481 has 2 divisors, whose sum is σ = 43194459482. Its totient is φ = 43194459480.

The previous prime is 43194459479. The next prime is 43194459541. The reversal of 43194459481 is 18495449134.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41934848400 + 1259611081 = 204780^2 + 35491^2 .

It is a cyclic number.

It is not a de Polignac number, because 43194459481 - 2¹ = 43194459479 is a prime.

It is a super-2 number, since 2×43194459481² (a number of 22 digits) contains 22 as substring.

Together with 43194459479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43194451481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21597229740 + 21597229741.

It is an arithmetic number, because the mean of its divisors is an integer number (21597229741).

Almost surely, 2^43194459481 is an apocalyptic number.

It is an amenable number.

43194459481 is a deficient number, since it is larger than the sum of its proper divisors (1).

43194459481 is an equidigital number, since it uses as much as digits as its factorization.

43194459481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 52.

The spelling of 43194459481 in words is "forty-three billion, one hundred ninety-four million, four hundred fifty-nine thousand, four hundred eighty-one".