806561121 has 16 divisors (see below), whose sum is σ = 1082056064. Its totient is φ = 534397824.

The previous prime is 806561101. The next prime is 806561123. The reversal of 806561121 is 121165608.

It is not a de Polignac number, because 806561121 - 2⁶ = 806561057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806561123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403701 + ... + 405693.

It is an arithmetic number, because the mean of its divisors is an integer number (67628504).

Almost surely, 2^806561121 is an apocalyptic number.

It is an amenable number.

806561121 is a deficient number, since it is larger than the sum of its proper divisors (275494943).

806561121 is a wasteful number, since it uses less digits than its factorization.

806561121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 806561121 is about 28400.0197359086. The cubic root of 806561121 is about 930.8486957240.

The spelling of 806561121 in words is "eight hundred six million, five hundred sixty-one thousand, one hundred twenty-one".