43194451481 has 2 divisors, whose sum is σ = 43194451482. Its totient is φ = 43194451480.

The previous prime is 43194451441. The next prime is 43194451523. The reversal of 43194451481 is 18415449134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43049610256 + 144841225 = 207484^2 + 12035^2 .

It is a cyclic number.

It is not a de Polignac number, because 43194451481 - 2²⁶ = 43127342617 is a prime.

It is a super-2 number, since 2×43194451481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43194451441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21597225740 + 21597225741.

It is an arithmetic number, because the mean of its divisors is an integer number (21597225741).

Almost surely, 2^43194451481 is an apocalyptic number.

It is an amenable number.

43194451481 is a deficient number, since it is larger than the sum of its proper divisors (1).

43194451481 is an equidigital number, since it uses as much as digits as its factorization.

43194451481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 44.

The spelling of 43194451481 in words is "forty-three billion, one hundred ninety-four million, four hundred fifty-one thousand, four hundred eighty-one".