409181 has 4 divisors (see below), whose sum is σ = 410652. Its totient is φ = 407712.

The previous prime is 409177. The next prime is 409187. The reversal of 409181 is 181904.

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 168100 + 241081 = 410^2 + 491^2 .

It is a cyclic number.

It is not a de Polignac number, because 409181 - 2² = 409177 is a prime.

It is a super-2 number, since 2×409181² = 334858181522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 409181.

It is not an unprimeable number, because it can be changed into a prime (409187) 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, 176 + ... + 921.

It is an arithmetic number, because the mean of its divisors is an integer number (102663).

2⁴⁰⁹¹⁸¹ is an apocalyptic number.

It is an amenable number.

409181 is a deficient number, since it is larger than the sum of its proper divisors (1471).

409181 is a wasteful number, since it uses less digits than its factorization.

409181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 409181 is about 639.6725724931. The cubic root of 409181 is about 74.2400894465.

The spelling of 409181 in words is "four hundred nine thousand, one hundred eighty-one".