2729409121 has 4 divisors (see below), whose sum is σ = 2734189744. Its totient is φ = 2724628500.

The previous prime is 2729409077. The next prime is 2729409127. The reversal of 2729409121 is 1219049272.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2729409121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2729409127) 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 3 ways as a sum of consecutive naturals, for example, 2389455 + ... + 2390596.

It is an arithmetic number, because the mean of its divisors is an integer number (683547436).

Almost surely, 2^2729409121 is an apocalyptic number.

It is an amenable number.

2729409121 is a deficient number, since it is larger than the sum of its proper divisors (4780623).

2729409121 is an equidigital number, since it uses as much as digits as its factorization.

2729409121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780622.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 2729409121 is about 52243.7471952386. The cubic root of 2729409121 is about 1397.5141467009.

The spelling of 2729409121 in words is "two billion, seven hundred twenty-nine million, four hundred nine thousand, one hundred twenty-one".