11616991 has 2 divisors, whose sum is σ = 11616992. Its totient is φ = 11616990.

The previous prime is 11616989. The next prime is 11617013. The reversal of 11616991 is 19961611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11616991 - 2¹ = 11616989 is a prime.

Together with 11616989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11616931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5808495 + 5808496.

It is an arithmetic number, because the mean of its divisors is an integer number (5808496).

Almost surely, 2^11616991 is an apocalyptic number.

11616991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11616991 is an equidigital number, since it uses as much as digits as its factorization.

11616991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 34.

The square root of 11616991 is about 3408.3707251413. The cubic root of 11616991 is about 226.4807098919.

The spelling of 11616991 in words is "eleven million, six hundred sixteen thousand, nine hundred ninety-one".