1317447647 has 4 divisors (see below), whose sum is σ = 1345478496. Its totient is φ = 1289416800.

The previous prime is 1317447619. The next prime is 1317447653. The reversal of 1317447647 is 7467447131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1317447647 - 2¹⁴ = 1317431263 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317447598 and 1317447607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317447347) 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 in 3 ways as a sum of consecutive naturals, for example, 14015354 + ... + 14015447.

It is an arithmetic number, because the mean of its divisors is an integer number (336369624).

Almost surely, 2^1317447647 is an apocalyptic number.

1317447647 is a deficient number, since it is larger than the sum of its proper divisors (28030849).

1317447647 is an equidigital number, since it uses as much as digits as its factorization.

1317447647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28030848.

The product of its digits is 395136, while the sum is 44.

The square root of 1317447647 is about 36296.6616509012. The cubic root of 1317447647 is about 1096.2538258858.

The spelling of 1317447647 in words is "one billion, three hundred seventeen million, four hundred forty-seven thousand, six hundred forty-seven".