80209891 has 2 divisors, whose sum is σ = 80209892. Its totient is φ = 80209890.

The previous prime is 80209867. The next prime is 80209897. The reversal of 80209891 is 19890208.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80209891 - 2¹⁷ = 80078819 is a prime.

It is a super-2 number, since 2×80209891² = 12867253228463762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 80209891.

It is not a weakly prime, because it can be changed into another prime (80209897) 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, 40104945 + 40104946.

It is an arithmetic number, because the mean of its divisors is an integer number (40104946).

Almost surely, 2^80209891 is an apocalyptic number.

80209891 is a deficient number, since it is larger than the sum of its proper divisors (1).

80209891 is an equidigital number, since it uses as much as digits as its factorization.

80209891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 80209891 is about 8955.9974877174. The cubic root of 80209891 is about 431.2634393067.

The spelling of 80209891 in words is "eighty million, two hundred nine thousand, eight hundred ninety-one".