991434673 has 2 divisors, whose sum is σ = 991434674. Its totient is φ = 991434672.

The previous prime is 991434671. The next prime is 991434709. The reversal of 991434673 is 376434199.

991434673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963047089 + 28387584 = 31033^2 + 5328^2 .

It is a cyclic number.

It is not a de Polignac number, because 991434673 - 2¹ = 991434671 is a prime.

Together with 991434671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (991434671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495717336 + 495717337.

It is an arithmetic number, because the mean of its divisors is an integer number (495717337).

Almost surely, 2^991434673 is an apocalyptic number.

It is an amenable number.

991434673 is a deficient number, since it is larger than the sum of its proper divisors (1).

991434673 is an equidigital number, since it uses as much as digits as its factorization.

991434673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 991434673 is about 31487.0556419618. The cubic root of 991434673 is about 997.1367003400.

The spelling of 991434673 in words is "nine hundred ninety-one million, four hundred thirty-four thousand, six hundred seventy-three".