1121720829 has 8 divisors (see below), whose sum is σ = 1508863872. Its totient is φ = 741195840.

The previous prime is 1121720813. The next prime is 1121720837. The reversal of 1121720829 is 9280271211.

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

It is not a de Polignac number, because 1121720829 - 2⁴ = 1121720813 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121720829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121722829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1654117 + ... + 1654794.

It is an arithmetic number, because the mean of its divisors is an integer number (188607984).

Almost surely, 2^1121720829 is an apocalyptic number.

It is an amenable number.

1121720829 is a deficient number, since it is larger than the sum of its proper divisors (387143043).

1121720829 is a wasteful number, since it uses less digits than its factorization.

1121720829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309027.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1121720829 is about 33492.1009941150. The cubic root of 1121720829 is about 1039.0304169214.

The spelling of 1121720829 in words is "one billion, one hundred twenty-one million, seven hundred twenty thousand, eight hundred twenty-nine".