1491327847 has 2 divisors, whose sum is σ = 1491327848. Its totient is φ = 1491327846.

The previous prime is 1491327829. The next prime is 1491327911. The reversal of 1491327847 is 7487231941.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491327847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1491327797 and 1491327806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491327547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745663923 + 745663924.

It is an arithmetic number, because the mean of its divisors is an integer number (745663924).

Almost surely, 2^1491327847 is an apocalyptic number.

1491327847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491327847 is an equidigital number, since it uses as much as digits as its factorization.

1491327847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 1491327847 is about 38617.7141607320. The cubic root of 1491327847 is about 1142.5039470486.

The spelling of 1491327847 in words is "one billion, four hundred ninety-one million, three hundred twenty-seven thousand, eight hundred forty-seven".