1123563391 has 2 divisors, whose sum is σ = 1123563392. Its totient is φ = 1123563390.

The previous prime is 1123563379. The next prime is 1123563431. The reversal of 1123563391 is 1933653211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123563391 - 2⁹ = 1123562879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123563361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561781695 + 561781696.

It is an arithmetic number, because the mean of its divisors is an integer number (561781696).

Almost surely, 2^1123563391 is an apocalyptic number.

1123563391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123563391 is an equidigital number, since it uses as much as digits as its factorization.

1123563391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 34.

The square root of 1123563391 is about 33519.5971187006. The cubic root of 1123563391 is about 1039.5990167059.

The spelling of 1123563391 in words is "one billion, one hundred twenty-three million, five hundred sixty-three thousand, three hundred ninety-one".