9117391 has 2 divisors, whose sum is σ = 9117392. Its totient is φ = 9117390.

The previous prime is 9117343. The next prime is 9117401. The reversal of 9117391 is 1937119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9117391 - 2⁷ = 9117263 is a prime.

It is a Chen prime.

9117391 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9117331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4558695 + 4558696.

It is an arithmetic number, because the mean of its divisors is an integer number (4558696).

Almost surely, 2^9117391 is an apocalyptic number.

9117391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9117391 is an equidigital number, since it uses as much as digits as its factorization.

9117391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701, while the sum is 31.

The square root of 9117391 is about 3019.5017800955. The cubic root of 9117391 is about 208.9088603941.

The spelling of 9117391 in words is "nine million, one hundred seventeen thousand, three hundred ninety-one".