3581181 has 12 divisors (see below), whose sum is σ = 5351580. Its totient is φ = 2304960.

The previous prime is 3581167. The next prime is 3581189. The reversal of 3581181 is 1811853.

3581181 is a `hidden beast` number, since 3 + 581 + 1 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1285956 + 2295225 = 1134^2 + 1515^2 .

It is not a de Polignac number, because 3581181 - 2⁶ = 3581117 is a prime.

It is a super-2 number, since 2×3581181² = 25649714709522, which contains 22 as substring.

3581181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3581189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6600 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (445965).

Almost surely, 2^3581181 is an apocalyptic number.

It is an amenable number.

3581181 is a deficient number, since it is larger than the sum of its proper divisors (1770399).

3581181 is a wasteful number, since it uses less digits than its factorization.

3581181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13756 (or 13753 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 3581181 is about 1892.4008560556. The cubic root of 3581181 is about 152.9943609353.

The spelling of 3581181 in words is "three million, five hundred eighty-one thousand, one hundred eighty-one".