1123154789 has 2 divisors, whose sum is σ = 1123154790. Its totient is φ = 1123154788.

The previous prime is 1123154749. The next prime is 1123154801. The reversal of 1123154789 is 9874513211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 983324164 + 139830625 = 31358^2 + 11825^2 .

It is an emirp because it is prime and its reverse (9874513211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1123154789 - 2²⁰ = 1122106213 is a prime.

It is a super-2 number, since 2×1123154789² = 2522953360107269042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123154719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561577394 + 561577395.

It is an arithmetic number, because the mean of its divisors is an integer number (561577395).

Almost surely, 2^1123154789 is an apocalyptic number.

It is an amenable number.

1123154789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123154789 is an equidigital number, since it uses as much as digits as its factorization.

1123154789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 1123154789 is about 33513.5015926417. The cubic root of 1123154789 is about 1039.4729790937.

The spelling of 1123154789 in words is "one billion, one hundred twenty-three million, one hundred fifty-four thousand, seven hundred eighty-nine".