1129789 has 2 divisors, whose sum is σ = 1129790. Its totient is φ = 1129788.

The previous prime is 1129787. The next prime is 1129819. The reversal of 1129789 is 9879211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 58564 = 1035^2 + 242^2 .

It is a cyclic number.

It is not a de Polignac number, because 1129789 - 2¹ = 1129787 is a prime.

Together with 1129787, it forms a pair of twin primes.

1129789 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564894 + 564895.

It is an arithmetic number, because the mean of its divisors is an integer number (564895).

2^1129789 is an apocalyptic number.

It is an amenable number.

1129789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129789 is an equidigital number, since it uses as much as digits as its factorization.

1129789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 37.

The square root of 1129789 is about 1062.9153305885. The cubic root of 1129789 is about 104.1515603338.

The spelling of 1129789 in words is "one million, one hundred twenty-nine thousand, seven hundred eighty-nine".