1123389287 has 2 divisors, whose sum is σ = 1123389288. Its totient is φ = 1123389286.

The previous prime is 1123389271. The next prime is 1123389331. The reversal of 1123389287 is 7829833211.

It is an a-pointer prime, because the next prime (1123389331) can be obtained adding 1123389287 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1123389287 - 2⁴ = 1123389271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123389247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561694643 + 561694644.

It is an arithmetic number, because the mean of its divisors is an integer number (561694644).

Almost surely, 2^1123389287 is an apocalyptic number.

1123389287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123389287 is an equidigital number, since it uses as much as digits as its factorization.

1123389287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 1123389287 is about 33516.9999701644. Note that the first 4 decimals coincide. The cubic root of 1123389287 is about 1039.5453162209.

The spelling of 1123389287 in words is "one billion, one hundred twenty-three million, three hundred eighty-nine thousand, two hundred eighty-seven".