491373847 has 2 divisors, whose sum is σ = 491373848. Its totient is φ = 491373846.

The previous prime is 491373821. The next prime is 491373893. The reversal of 491373847 is 748373194.

It is an a-pointer prime, because the next prime (491373893) can be obtained adding 491373847 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491373847 - 2⁷ = 491373719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491373797 and 491373806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491373647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245686923 + 245686924.

It is an arithmetic number, because the mean of its divisors is an integer number (245686924).

Almost surely, 2^491373847 is an apocalyptic number.

491373847 is a deficient number, since it is larger than the sum of its proper divisors (1).

491373847 is an equidigital number, since it uses as much as digits as its factorization.

491373847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The square root of 491373847 is about 22166.9539404944. The cubic root of 491373847 is about 789.1096346136.

The spelling of 491373847 in words is "four hundred ninety-one million, three hundred seventy-three thousand, eight hundred forty-seven".