809192121 has 16 divisors (see below), whose sum is σ = 1140729600. Its totient is φ = 508809168.

The previous prime is 809192117. The next prime is 809192143. The reversal of 809192121 is 121291908.

809192121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 809192121 - 2² = 809192117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (809192161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18331 + ... + 44208.

It is an arithmetic number, because the mean of its divisors is an integer number (71295600).

Almost surely, 2^809192121 is an apocalyptic number.

It is an amenable number.

809192121 is a deficient number, since it is larger than the sum of its proper divisors (331537479).

809192121 is a wasteful number, since it uses less digits than its factorization.

809192121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62788.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 809192121 is about 28446.3024134948. The cubic root of 809192121 is about 931.8597390803.

The spelling of 809192121 in words is "eight hundred nine million, one hundred ninety-two thousand, one hundred twenty-one".