80891191 has 2 divisors, whose sum is σ = 80891192. Its totient is φ = 80891190.

The previous prime is 80891149. The next prime is 80891201. The reversal of 80891191 is 19119808.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80891191 - 2⁹ = 80890679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80891191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80892191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40445595 + 40445596.

It is an arithmetic number, because the mean of its divisors is an integer number (40445596).

Almost surely, 2^80891191 is an apocalyptic number.

80891191 is a deficient number, since it is larger than the sum of its proper divisors (1).

80891191 is an equidigital number, since it uses as much as digits as its factorization.

80891191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 80891191 is about 8993.9530241157. The cubic root of 80891191 is about 432.4810438638.

The spelling of 80891191 in words is "eighty million, eight hundred ninety-one thousand, one hundred ninety-one".