3722161 has 4 divisors (see below), whose sum is σ = 3726324. Its totient is φ = 3718000.

The previous prime is 3722149. The next prime is 3722171. The reversal of 3722161 is 1612273.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1612273 = 13 ⋅124021.

It can be written as a sum of positive squares in 2 ways, for example, as 680625 + 3041536 = 825^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 3722161 - 2⁵ = 3722129 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3722101) 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, 130 + ... + 2731.

It is an arithmetic number, because the mean of its divisors is an integer number (931581).

Almost surely, 2^3722161 is an apocalyptic number.

It is an amenable number.

3722161 is a deficient number, since it is larger than the sum of its proper divisors (4163).

3722161 is a wasteful number, since it uses less digits than its factorization.

3722161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162.

The product of its digits is 504, while the sum is 22.

The square root of 3722161 is about 1929.2902840164. The cubic root of 3722161 is about 154.9762155666.

It can be divided in two parts, 3722 and 161, that added together give a palindrome (3883).

The spelling of 3722161 in words is "three million, seven hundred twenty-two thousand, one hundred sixty-one".