11721129 has 8 divisors (see below), whose sum is σ = 17860800. Its totient is φ = 6697776.

The previous prime is 11721113. The next prime is 11721139. The reversal of 11721129 is 92112711.

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

It is not a de Polignac number, because 11721129 - 2⁴ = 11721113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11721099 and 11721108.

It is not an unprimeable number, because it can be changed into a prime (11721139) 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 in 7 ways as a sum of consecutive naturals, for example, 279054 + ... + 279095.

It is an arithmetic number, because the mean of its divisors is an integer number (2232600).

Almost surely, 2^11721129 is an apocalyptic number.

It is an amenable number.

11721129 is a deficient number, since it is larger than the sum of its proper divisors (6139671).

11721129 is an equidigital number, since it uses as much as digits as its factorization.

11721129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558159.

The product of its digits is 252, while the sum is 24.

The square root of 11721129 is about 3423.6134419645. The cubic root of 11721129 is about 227.1554434814.

The spelling of 11721129 in words is "eleven million, seven hundred twenty-one thousand, one hundred twenty-nine".