11109557 has 2 divisors, whose sum is σ = 11109558. Its totient is φ = 11109556.

The previous prime is 11109521. The next prime is 11109559. The reversal of 11109557 is 75590111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 2193361 = 2986^2 + 1481^2 .

It is a cyclic number.

It is not a de Polignac number, because 11109557 - 2⁶ = 11109493 is a prime.

Together with 11109559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11109559) 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, 5554778 + 5554779.

It is an arithmetic number, because the mean of its divisors is an integer number (5554779).

Almost surely, 2^11109557 is an apocalyptic number.

It is an amenable number.

11109557 is a deficient number, since it is larger than the sum of its proper divisors (1).

11109557 is an equidigital number, since it uses as much as digits as its factorization.

11109557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1575, while the sum is 29.

The square root of 11109557 is about 3333.1002085146. The cubic root of 11109557 is about 223.1339124771.

Adding to 11109557 its reverse (75590111), we get a palindrome (86699668).

The spelling of 11109557 in words is "eleven million, one hundred nine thousand, five hundred fifty-seven".