1129961721 has 8 divisors (see below), whose sum is σ = 1721846464. Its totient is φ = 645692400.

The previous prime is 1129961683. The next prime is 1129961753. The reversal of 1129961721 is 1271699211.

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

It is not a de Polignac number, because 1129961721 - 2²² = 1125767417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1129961721.

It is not an unprimeable number, because it can be changed into a prime (1129961761) 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, 26903830 + ... + 26903871.

It is an arithmetic number, because the mean of its divisors is an integer number (215230808).

Almost surely, 2^1129961721 is an apocalyptic number.

It is an amenable number.

1129961721 is a deficient number, since it is larger than the sum of its proper divisors (591884743).

1129961721 is an equidigital number, since it uses as much as digits as its factorization.

1129961721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53807711.

The product of its digits is 13608, while the sum is 39.

The square root of 1129961721 is about 33614.9032573351. The cubic root of 1129961721 is about 1041.5686759178.

The spelling of 1129961721 in words is "one billion, one hundred twenty-nine million, nine hundred sixty-one thousand, seven hundred twenty-one".