1129723169 has 2 divisors, whose sum is σ = 1129723170. Its totient is φ = 1129723168.

The previous prime is 1129723157. The next prime is 1129723187. The reversal of 1129723169 is 9613279211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944763169 + 184960000 = 30737^2 + 13600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1129723169 is a prime.

It is a super-2 number, since 2×1129723169² = 2552548877150805122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1129723069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564861584 + 564861585.

It is an arithmetic number, because the mean of its divisors is an integer number (564861585).

Almost surely, 2^1129723169 is an apocalyptic number.

It is an amenable number.

1129723169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129723169 is an equidigital number, since it uses as much as digits as its factorization.

1129723169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 1129723169 is about 33611.3547629369. The cubic root of 1129723169 is about 1041.4953737952.

The spelling of 1129723169 in words is "one billion, one hundred twenty-nine million, seven hundred twenty-three thousand, one hundred sixty-nine".