3642181 has 4 divisors (see below), whose sum is σ = 3647212. Its totient is φ = 3637152.

The previous prime is 3642157. The next prime is 3642203. The reversal of 3642181 is 1812463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1812463 = 193 ⋅9391.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 2356225 = 1134^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 3642181 - 2²¹ = 1545029 is a prime.

It is a super-2 number, since 2×3642181² = 26530964873522, 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 (3642101) 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, 1200 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (911803).

Almost surely, 2^3642181 is an apocalyptic number.

It is an amenable number.

3642181 is a deficient number, since it is larger than the sum of its proper divisors (5031).

3642181 is an equidigital number, since it uses as much as digits as its factorization.

3642181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030.

The product of its digits is 1152, while the sum is 25.

The square root of 3642181 is about 1908.4498945479. The cubic root of 3642181 is about 153.8581507119.

The spelling of 3642181 in words is "three million, six hundred forty-two thousand, one hundred eighty-one".