1317947 has 2 divisors, whose sum is σ = 1317948.
Its totient is φ = 1317946.
The previous prime is 1317941. The next prime is 1317961. The reversal of 1317947 is 7497131.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1317947 - 28 = 1317691 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (1317941) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658973 + 658974.
It is an arithmetic number, because the mean of its divisors is an integer number (658974).
21317947 is an apocalyptic number.
1317947 is a deficient number, since it is larger than the sum of its proper divisors (1).
1317947 is an equidigital number, since it uses as much as digits as its factorization.
1317947 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5292, while the sum is 32.
The square root of 1317947 is about 1148.0187280702.
The cubic root of 1317947 is about 109.6392312980.
The spelling of 1317947 in words is "one million, three hundred seventeen thousand, nine hundred forty-seven".