80491 has 2 divisors, whose sum is σ = 80492. Its totient is φ = 80490.

The previous prime is 80489. The next prime is 80513. The reversal of 80491 is 19408.

It is an a-pointer prime, because the next prime (80513) can be obtained adding 80491 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80491 - 2¹ = 80489 is a prime.

Together with 80489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (80471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40245 + 40246.

It is an arithmetic number, because the mean of its divisors is an integer number (40246).

2⁸⁰⁴⁹¹ is an apocalyptic number.

80491 is a deficient number, since it is larger than the sum of its proper divisors (1).

80491 is an equidigital number, since it uses as much as digits as its factorization.

80491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 80491 is about 283.7093583229. The cubic root of 80491 is about 43.1766663542.

Adding to 80491 its reverse (19408), we get a palindrome (99899).

The spelling of 80491 in words is "eighty thousand, four hundred ninety-one".