491585023 has 2 divisors, whose sum is σ = 491585024. Its totient is φ = 491585022.

The previous prime is 491585021. The next prime is 491585027. The reversal of 491585023 is 320585194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491585023 - 2¹ = 491585021 is a prime.

Together with 491585021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491585021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245792511 + 245792512.

It is an arithmetic number, because the mean of its divisors is an integer number (245792512).

Almost surely, 2^491585023 is an apocalyptic number.

491585023 is a deficient number, since it is larger than the sum of its proper divisors (1).

491585023 is an equidigital number, since it uses as much as digits as its factorization.

491585023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 491585023 is about 22171.7167355169. The cubic root of 491585023 is about 789.2226627087. Note that the first 3 decimals are identical.

The spelling of 491585023 in words is "four hundred ninety-one million, five hundred eighty-five thousand, twenty-three".