180491 has 2 divisors, whose sum is σ = 180492. Its totient is φ = 180490.

The previous prime is 180473. The next prime is 180497. The reversal of 180491 is 194081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180491 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 180491.

It is not a weakly prime, because it can be changed into another prime (180497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90245 + 90246.

It is an arithmetic number, because the mean of its divisors is an integer number (90246).

2¹⁸⁰⁴⁹¹ is an apocalyptic number.

180491 is a deficient number, since it is larger than the sum of its proper divisors (1).

180491 is an equidigital number, since it uses as much as digits as its factorization.

180491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 180491 is about 424.8423236920. The cubic root of 180491 is about 56.5134538666.

The spelling of 180491 in words is "one hundred eighty thousand, four hundred ninety-one".