3660181 has 4 divisors (see below), whose sum is σ = 4183072. Its totient is φ = 3137292.

The previous prime is 3660131. The next prime is 3660187. The reversal of 3660181 is 1810663.

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: 1810663 = 61 ⋅29683.

It is a cyclic number.

It is not a de Polignac number, because 3660181 - 2⁷ = 3660053 is a prime.

It is a super-2 number, since 2×3660181² = 26793849905522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660187) 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, 261435 + ... + 261448.

It is an arithmetic number, because the mean of its divisors is an integer number (1045768).

Almost surely, 2^3660181 is an apocalyptic number.

It is an amenable number.

3660181 is a deficient number, since it is larger than the sum of its proper divisors (522891).

3660181 is an equidigital number, since it uses as much as digits as its factorization.

3660181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522890.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3660181 is about 1913.1599514939. The cubic root of 3660181 is about 154.1111947817. Note that the first 4 decimals are identical.

The spelling of 3660181 in words is "three million, six hundred sixty thousand, one hundred eighty-one".