11639557 has 2 divisors, whose sum is σ = 11639558. Its totient is φ = 11639556.

The previous prime is 11639521. The next prime is 11639561. The reversal of 11639557 is 75593611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6482116 + 5157441 = 2546^2 + 2271^2 .

It is a cyclic number.

It is not a de Polignac number, because 11639557 - 2⁷ = 11639429 is a 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 (11669557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5819778 + 5819779.

It is an arithmetic number, because the mean of its divisors is an integer number (5819779).

Almost surely, 2^11639557 is an apocalyptic number.

It is an amenable number.

11639557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11639557 is an equidigital number, since it uses as much as digits as its factorization.

11639557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 11639557 is about 3411.6794984289. The cubic root of 11639557 is about 226.6272612679.

The spelling of 11639557 in words is "eleven million, six hundred thirty-nine thousand, five hundred fifty-seven".