43491167971 has 2 divisors, whose sum is σ = 43491167972. Its totient is φ = 43491167970.

The previous prime is 43491167921. The next prime is 43491168011. The reversal of 43491167971 is 17976119434.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43491167971 is a prime.

It is not a weakly prime, because it can be changed into another prime (43491167921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21745583985 + 21745583986.

It is an arithmetic number, because the mean of its divisors is an integer number (21745583986).

Almost surely, 2^43491167971 is an apocalyptic number.

43491167971 is a deficient number, since it is larger than the sum of its proper divisors (1).

43491167971 is an equidigital number, since it uses as much as digits as its factorization.

43491167971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The spelling of 43491167971 in words is "forty-three billion, four hundred ninety-one million, one hundred sixty-seven thousand, nine hundred seventy-one".