80010991 has 2 divisors, whose sum is σ = 80010992. Its totient is φ = 80010990.

The previous prime is 80010961. The next prime is 80011013. The reversal of 80010991 is 19901008.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80010991 - 2⁷ = 80010863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80010941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40005495 + 40005496.

It is an arithmetic number, because the mean of its divisors is an integer number (40005496).

Almost surely, 2^80010991 is an apocalyptic number.

80010991 is a deficient number, since it is larger than the sum of its proper divisors (1).

80010991 is an equidigital number, since it uses as much as digits as its factorization.

80010991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 80010991 is about 8944.8863044759. The cubic root of 80010991 is about 430.9066699292.

Adding to 80010991 its reverse (19901008), we get a palindrome (99911999).

The spelling of 80010991 in words is "eighty million, ten thousand, nine hundred ninety-one".