1129957729 has 4 divisors (see below), whose sum is σ = 1145436676. Its totient is φ = 1114478784.

The previous prime is 1129957709. The next prime is 1129957757. The reversal of 1129957729 is 9277599211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 750760000 + 379197729 = 27400^2 + 19473^2 .

It is a cyclic number.

It is not a de Polignac number, because 1129957729 - 2⁹ = 1129957217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1129957709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7739364 + ... + 7739509.

It is an arithmetic number, because the mean of its divisors is an integer number (286359169).

Almost surely, 2^1129957729 is an apocalyptic number.

It is an amenable number.

1129957729 is a deficient number, since it is larger than the sum of its proper divisors (15478947).

1129957729 is an equidigital number, since it uses as much as digits as its factorization.

1129957729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15478946.

The product of its digits is 714420, while the sum is 52.

The square root of 1129957729 is about 33614.8438788580. The cubic root of 1129957729 is about 1041.5674493432.

The spelling of 1129957729 in words is "one billion, one hundred twenty-nine million, nine hundred fifty-seven thousand, seven hundred twenty-nine".