11608991 has 2 divisors, whose sum is σ = 11608992. Its totient is φ = 11608990.

The previous prime is 11608979. The next prime is 11608999. The reversal of 11608991 is 19980611.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11608991 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 (11608999) 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, 5804495 + 5804496.

It is an arithmetic number, because the mean of its divisors is an integer number (5804496).

Almost surely, 2^11608991 is an apocalyptic number.

11608991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11608991 is an equidigital number, since it uses as much as digits as its factorization.

11608991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 11608991 is about 3407.1969417690. The cubic root of 11608991 is about 226.4287095720.

The spelling of 11608991 in words is "eleven million, six hundred eight thousand, nine hundred ninety-one".