11113561 has 2 divisors, whose sum is σ = 11113562. Its totient is φ = 11113560.

The previous prime is 11113549. The next prime is 11113567. The reversal of 11113561 is 16531111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6095961 + 5017600 = 2469^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 11113561 - 2⁷ = 11113433 is a prime.

It is a super-2 number, since 2×11113561² = 247022476201442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11113567) 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, 5556780 + 5556781.

It is an arithmetic number, because the mean of its divisors is an integer number (5556781).

Almost surely, 2^11113561 is an apocalyptic number.

It is an amenable number.

11113561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11113561 is an equidigital number, since it uses as much as digits as its factorization.

11113561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 19.

The square root of 11113561 is about 3333.7007964123. The cubic root of 11113561 is about 223.1607158523.

Adding to 11113561 its reverse (16531111), we get a palindrome (27644672).

The spelling of 11113561 in words is "eleven million, one hundred thirteen thousand, five hundred sixty-one".