1123989431 has 2 divisors, whose sum is σ = 1123989432. Its totient is φ = 1123989430.

The previous prime is 1123989421. The next prime is 1123989439. The reversal of 1123989431 is 1349893211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123989431 is a prime.

It is a super-2 number, since 2×1123989431² = 2526704481999407522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123989439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561994715 + 561994716.

It is an arithmetic number, because the mean of its divisors is an integer number (561994716).

Almost surely, 2^1123989431 is an apocalyptic number.

1123989431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123989431 is an equidigital number, since it uses as much as digits as its factorization.

1123989431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 1123989431 is about 33525.9516046898. The cubic root of 1123989431 is about 1039.7304007169.

The spelling of 1123989431 in words is "one billion, one hundred twenty-three million, nine hundred eighty-nine thousand, four hundred thirty-one".