3721161 has 4 divisors (see below), whose sum is σ = 4961552. Its totient is φ = 2480772.

The previous prime is 3721153. The next prime is 3721163. The reversal of 3721161 is 1611273.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1611273 = 3 ⋅537091.

It is not a de Polignac number, because 3721161 - 2³ = 3721153 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3721163) 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, 620191 + ... + 620196.

It is an arithmetic number, because the mean of its divisors is an integer number (1240388).

Almost surely, 2^3721161 is an apocalyptic number.

It is an amenable number.

3721161 is a deficient number, since it is larger than the sum of its proper divisors (1240391).

3721161 is a wasteful number, since it uses less digits than its factorization.

3721161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240390.

The product of its digits is 252, while the sum is 21.

The square root of 3721161 is about 1929.0311039483. The cubic root of 3721161 is about 154.9623356282.

The spelling of 3721161 in words is "three million, seven hundred twenty-one thousand, one hundred sixty-one".