1317887 has 2 divisors, whose sum is σ = 1317888. Its totient is φ = 1317886.

The previous prime is 1317881. The next prime is 1317917. The reversal of 1317887 is 7887131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1317887 is a prime.

It is a super-2 number, since 2×1317887² = 3473652289538, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1317881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658943 + 658944.

It is an arithmetic number, because the mean of its divisors is an integer number (658944).

2^1317887 is an apocalyptic number.

1317887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1317887 is an equidigital number, since it uses as much as digits as its factorization.

1317887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 35.

The square root of 1317887 is about 1147.9925957949. The cubic root of 1317887 is about 109.6375674846.

The spelling of 1317887 in words is "one million, three hundred seventeen thousand, eight hundred eighty-seven".