891322073 has 2 divisors, whose sum is σ = 891322074. Its totient is φ = 891322072.

The previous prime is 891322051. The next prime is 891322079. The reversal of 891322073 is 370223198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864830464 + 26491609 = 29408^2 + 5147^2 .

It is a cyclic number.

It is not a de Polignac number, because 891322073 - 2⁶ = 891322009 is a prime.

It is not a weakly prime, because it can be changed into another prime (891322079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445661036 + 445661037.

It is an arithmetic number, because the mean of its divisors is an integer number (445661037).

Almost surely, 2^891322073 is an apocalyptic number.

It is an amenable number.

891322073 is a deficient number, since it is larger than the sum of its proper divisors (1).

891322073 is an equidigital number, since it uses as much as digits as its factorization.

891322073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 891322073 is about 29855.0175514938. The cubic root of 891322073 is about 962.3762289375.

The spelling of 891322073 in words is "eight hundred ninety-one million, three hundred twenty-two thousand, seventy-three".