491087473 has 2 divisors, whose sum is σ = 491087474. Its totient is φ = 491087472.

The previous prime is 491087437. The next prime is 491087497. The reversal of 491087473 is 374780194.

Together with previous prime (491087437) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248755984 + 242331489 = 15772^2 + 15567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491087473 is a prime.

It is a super-2 number, since 2×491087473² = 482333812275051458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491087413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245543736 + 245543737.

It is an arithmetic number, because the mean of its divisors is an integer number (245543737).

Almost surely, 2^491087473 is an apocalyptic number.

It is an amenable number.

491087473 is a deficient number, since it is larger than the sum of its proper divisors (1).

491087473 is an equidigital number, since it uses as much as digits as its factorization.

491087473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 491087473 is about 22160.4935188727. The cubic root of 491087473 is about 788.9563064171.

The spelling of 491087473 in words is "four hundred ninety-one million, eighty-seven thousand, four hundred seventy-three".