3618181 has 4 divisors (see below), whose sum is σ = 4135072. Its totient is φ = 3101292.

The previous prime is 3618163. The next prime is 3618187. The reversal of 3618181 is 1818163.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 3618181 - 2²¹ = 1521029 is a prime.

It is a super-2 number, since 2×3618181² = 26182467497522, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3618187) 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, 258435 + ... + 258448.

It is an arithmetic number, because the mean of its divisors is an integer number (1033768).

Almost surely, 2^3618181 is an apocalyptic number.

It is an amenable number.

3618181 is a deficient number, since it is larger than the sum of its proper divisors (516891).

3618181 is an equidigital number, since it uses as much as digits as its factorization.

3618181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516890.

The product of its digits is 1152, while the sum is 28.

The square root of 3618181 is about 1902.1516763918. The cubic root of 3618181 is about 153.5194583940.

The spelling of 3618181 in words is "three million, six hundred eighteen thousand, one hundred eighty-one".