4105721161 has 4 divisors (see below), whose sum is σ = 4183187652. Its totient is φ = 4028254672.

The previous prime is 4105721129. The next prime is 4105721167. The reversal of 4105721161 is 1611275014.

4105721161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3772293561 + 333427600 = 61419^2 + 18260^2 .

It is a cyclic number.

It is not a de Polignac number, because 4105721161 - 2⁵ = 4105721129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4105721167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38733166 + ... + 38733271.

It is an arithmetic number, because the mean of its divisors is an integer number (1045796913).

Almost surely, 2^4105721161 is an apocalyptic number.

It is an amenable number.

4105721161 is a deficient number, since it is larger than the sum of its proper divisors (77466491).

4105721161 is an equidigital number, since it uses as much as digits as its factorization.

4105721161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77466490.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 4105721161 is about 64075.9015621318. The cubic root of 4105721161 is about 1601.2647761218.

Adding to 4105721161 its reverse (1611275014), we get a palindrome (5716996175).

The spelling of 4105721161 in words is "four billion, one hundred five million, seven hundred twenty-one thousand, one hundred sixty-one".