8160991 has 2 divisors, whose sum is σ = 8160992. Its totient is φ = 8160990.

The previous prime is 8160989. The next prime is 8161001. The reversal of 8160991 is 1990618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8160991 - 2¹ = 8160989 is a prime.

Together with 8160989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8160931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4080495 + 4080496.

It is an arithmetic number, because the mean of its divisors is an integer number (4080496).

Almost surely, 2^8160991 is an apocalyptic number.

8160991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8160991 is an equidigital number, since it uses as much as digits as its factorization.

8160991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 8160991 is about 2856.7448258464. The cubic root of 8160991 is about 201.3326916075.

The spelling of 8160991 in words is "eight million, one hundred sixty thousand, nine hundred ninety-one".