1129721109 has 8 divisors (see below), whose sum is σ = 1643230752. Its totient is φ = 684679440.

The previous prime is 1129721081. The next prime is 1129721119. The reversal of 1129721109 is 9011279211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1129721109 - 2⁹ = 1129720597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 34233973 = 1129721109 / (1 + 1 + 2 + 9 + 7 + 2 + 1 + 1 + 0 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 1129721109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1129721119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17116954 + ... + 17117019.

It is an arithmetic number, because the mean of its divisors is an integer number (205403844).

Almost surely, 2^1129721109 is an apocalyptic number.

It is an amenable number.

1129721109 is a deficient number, since it is larger than the sum of its proper divisors (513509643).

1129721109 is a wasteful number, since it uses less digits than its factorization.

1129721109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34233987.

The product of its (nonzero) digits is 2268, while the sum is 33.

The square root of 1129721109 is about 33611.3241185170. The cubic root of 1129721109 is about 1041.4947407546.

The spelling of 1129721109 in words is "one billion, one hundred twenty-nine million, seven hundred twenty-one thousand, one hundred nine".