80105991 has 16 divisors (see below), whose sum is σ = 122429184. Its totient is φ = 45638784.

The previous prime is 80105983. The next prime is 80106043. The reversal of 80105991 is 19950108.

It is not a de Polignac number, because 80105991 - 2³ = 80105983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80105951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1791 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (7651824).

Almost surely, 2^80105991 is an apocalyptic number.

80105991 is a deficient number, since it is larger than the sum of its proper divisors (42323193).

80105991 is a wasteful number, since it uses less digits than its factorization.

80105991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11350.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 80105991 is about 8950.1950258081. The cubic root of 80105991 is about 431.0771462689.

The spelling of 80105991 in words is "eighty million, one hundred five thousand, nine hundred ninety-one".