11729121 has 4 divisors (see below), whose sum is σ = 15638832. Its totient is φ = 7819412.

The previous prime is 11729093. The next prime is 11729147. The reversal of 11729121 is 12192711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12192711 = 3 ⋅4064237.

It is a cyclic number.

It is not a de Polignac number, because 11729121 - 2¹¹ = 11727073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11729091 and 11729100.

It is not an unprimeable number, because it can be changed into a prime (11729171) 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 3 ways as a sum of consecutive naturals, for example, 1954851 + ... + 1954856.

It is an arithmetic number, because the mean of its divisors is an integer number (3909708).

Almost surely, 2^11729121 is an apocalyptic number.

It is an amenable number.

11729121 is a deficient number, since it is larger than the sum of its proper divisors (3909711).

11729121 is an equidigital number, since it uses as much as digits as its factorization.

11729121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909710.

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

The square root of 11729121 is about 3424.7804309182. The cubic root of 11729121 is about 227.2070600634.

The spelling of 11729121 in words is "eleven million, seven hundred twenty-nine thousand, one hundred twenty-one".