4021181 has 4 divisors (see below), whose sum is σ = 4087164. Its totient is φ = 3955200.

The previous prime is 4021177. The next prime is 4021183. The reversal of 4021181 is 1811204.

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 156025 + 3865156 = 395^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021181 - 2² = 4021177 is a prime.

It is a super-2 number, since 2×4021181² = 32339793269522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021183) 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, 32900 + ... + 33021.

It is an arithmetic number, because the mean of its divisors is an integer number (1021791).

Almost surely, 2^4021181 is an apocalyptic number.

It is an amenable number.

4021181 is a deficient number, since it is larger than the sum of its proper divisors (65983).

4021181 is an equidigital number, since it uses as much as digits as its factorization.

4021181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65982.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 4021181 is about 2005.2882585803. The cubic root of 4021181 is about 159.0198016028.

Adding to 4021181 its reverse (1811204), we get a palindrome (5832385).

The spelling of 4021181 in words is "four million, twenty-one thousand, one hundred eighty-one".