80187817 has 2 divisors, whose sum is σ = 80187818. Its totient is φ = 80187816.

The previous prime is 80187797. The next prime is 80187823. The reversal of 80187817 is 71878108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44235801 + 35952016 = 6651^2 + 5996^2 .

It is a cyclic number.

It is not a de Polignac number, because 80187817 - 2¹¹ = 80185769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80187817.

It is not a weakly prime, because it can be changed into another prime (80187857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40093908 + 40093909.

It is an arithmetic number, because the mean of its divisors is an integer number (40093909).

Almost surely, 2^80187817 is an apocalyptic number.

It is an amenable number.

80187817 is a deficient number, since it is larger than the sum of its proper divisors (1).

80187817 is an equidigital number, since it uses as much as digits as its factorization.

80187817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 80187817 is about 8954.7650443772. The cubic root of 80187817 is about 431.2238740176.

The spelling of 80187817 in words is "eighty million, one hundred eighty-seven thousand, eight hundred seventeen".