6721161 has 16 divisors (see below), whose sum is σ = 9287808. Its totient is φ = 4320000.

The previous prime is 6721159. The next prime is 6721177. The reversal of 6721161 is 1611276.

6721161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6721161 - 2¹ = 6721159 is a prime.

It is a Curzon number.

6721161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6721181) 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, 16561 + ... + 16961.

It is an arithmetic number, because the mean of its divisors is an integer number (580488).

Almost surely, 2^6721161 is an apocalyptic number.

It is an amenable number.

6721161 is a deficient number, since it is larger than the sum of its proper divisors (2566647).

6721161 is a wasteful number, since it uses less digits than its factorization.

6721161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592.

The product of its digits is 504, while the sum is 24.

The square root of 6721161 is about 2592.5202024285. The cubic root of 6721161 is about 188.7186261319.

The spelling of 6721161 in words is "six million, seven hundred twenty-one thousand, one hundred sixty-one".