11308991 has 2 divisors, whose sum is σ = 11308992. Its totient is φ = 11308990.

The previous prime is 11308909. The next prime is 11309021. The reversal of 11308991 is 19980311.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11308991 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11308091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5654495 + 5654496.

It is an arithmetic number, because the mean of its divisors is an integer number (5654496).

Almost surely, 2^11308991 is an apocalyptic number.

11308991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11308991 is an equidigital number, since it uses as much as digits as its factorization.

11308991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 11308991 is about 3362.8843274784. The cubic root of 11308991 is about 224.4612029788.

The spelling of 11308991 in words is "eleven million, three hundred eight thousand, nine hundred ninety-one".