11591557 has 2 divisors, whose sum is σ = 11591558. Its totient is φ = 11591556.

The previous prime is 11591549. The next prime is 11591581. The reversal of 11591557 is 75519511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9278116 + 2313441 = 3046^2 + 1521^2 .

It is a cyclic number.

It is not a de Polignac number, because 11591557 - 2³ = 11591549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11591507) 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, 5795778 + 5795779.

It is an arithmetic number, because the mean of its divisors is an integer number (5795779).

Almost surely, 2^11591557 is an apocalyptic number.

It is an amenable number.

11591557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11591557 is an equidigital number, since it uses as much as digits as its factorization.

11591557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 34.

The square root of 11591557 is about 3404.6375724884. The cubic root of 11591557 is about 226.3153050600.

The spelling of 11591557 in words is "eleven million, five hundred ninety-one thousand, five hundred fifty-seven".