11921729 has 2 divisors, whose sum is σ = 11921730. Its totient is φ = 11921728.

The previous prime is 11921719. The next prime is 11921753. The reversal of 11921729 is 92712911.

11921729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7182400 + 4739329 = 2680^2 + 2177^2 .

It is a cyclic number.

It is not a de Polignac number, because 11921729 - 2⁴ = 11921713 is a prime.

It is a Chen prime.

It is equal to p₇₈₃₂₃₉ and since 11921729 and 783239 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 11921695 and 11921704.

It is not a weakly prime, because it can be changed into another prime (11921719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5960864 + 5960865.

It is an arithmetic number, because the mean of its divisors is an integer number (5960865).

Almost surely, 2^11921729 is an apocalyptic number.

It is an amenable number.

11921729 is a deficient number, since it is larger than the sum of its proper divisors (1).

11921729 is an equidigital number, since it uses as much as digits as its factorization.

11921729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 32.

The square root of 11921729 is about 3452.7856869490. The cubic root of 11921729 is about 228.4439960619.

The spelling of 11921729 in words is "eleven million, nine hundred twenty-one thousand, seven hundred twenty-nine".