1113543121 has 2 divisors, whose sum is σ = 1113543122. Its totient is φ = 1113543120.

The previous prime is 1113543113. The next prime is 1113543161. The reversal of 1113543121 is 1213453111.

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., 1109622721 + 3920400 = 33311^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1113543121 - 2³ = 1113543113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1113543092 and 1113543101.

It is not a weakly prime, because it can be changed into another prime (1113543161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556771560 + 556771561.

It is an arithmetic number, because the mean of its divisors is an integer number (556771561).

Almost surely, 2^1113543121 is an apocalyptic number.

It is an amenable number.

1113543121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1113543121 is an equidigital number, since it uses as much as digits as its factorization.

1113543121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 1113543121 is about 33369.7935414650. The cubic root of 1113543121 is about 1036.4992999911.

Adding to 1113543121 its reverse (1213453111), we get a palindrome (2326996232).

The spelling of 1113543121 in words is "one billion, one hundred thirteen million, five hundred forty-three thousand, one hundred twenty-one".