11720591 has 2 divisors, whose sum is σ = 11720592. Its totient is φ = 11720590.

The previous prime is 11720581. The next prime is 11720603. The reversal of 11720591 is 19502711.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11720591 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11720591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11720551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860295 + 5860296.

It is an arithmetic number, because the mean of its divisors is an integer number (5860296).

Almost surely, 2^11720591 is an apocalyptic number.

11720591 is a deficient number, since it is larger than the sum of its proper divisors (1).

11720591 is an equidigital number, since it uses as much as digits as its factorization.

11720591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 11720591 is about 3423.5348691082. The cubic root of 11720591 is about 227.1519679488.

The spelling of 11720591 in words is "eleven million, seven hundred twenty thousand, five hundred ninety-one".