9915391 has 2 divisors, whose sum is σ = 9915392. Its totient is φ = 9915390.

The previous prime is 9915379. The next prime is 9915407. The reversal of 9915391 is 1935199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9915391 - 2¹⁹ = 9391103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9915391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9915331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4957695 + 4957696.

It is an arithmetic number, because the mean of its divisors is an integer number (4957696).

Almost surely, 2^9915391 is an apocalyptic number.

9915391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9915391 is an equidigital number, since it uses as much as digits as its factorization.

9915391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10935, while the sum is 37.

The square root of 9915391 is about 3148.8713851156. The cubic root of 9915391 is about 214.8341320296.

The spelling of 9915391 in words is "nine million, nine hundred fifteen thousand, three hundred ninety-one".