418181 has 2 divisors, whose sum is σ = 418182. Its totient is φ = 418180.

The previous prime is 418177. The next prime is 418189. The reversal of 418181 is 181814.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 27556 = 625^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 418181 - 2² = 418177 is a prime.

It is a super-2 number, since 2×418181² = 349750697522, which contains 22 as substring.

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

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 418181.

It is not a weakly prime, because it can be changed into another prime (418189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209090 + 209091.

It is an arithmetic number, because the mean of its divisors is an integer number (209091).

2⁴¹⁸¹⁸¹ is an apocalyptic number.

It is an amenable number.

418181 is a deficient number, since it is larger than the sum of its proper divisors (1).

418181 is an equidigital number, since it uses as much as digits as its factorization.

418181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 23.

The square root of 418181 is about 646.6691580708. The cubic root of 418181 is about 74.7804542523.

Adding to 418181 its reverse (181814), we get a palindrome (599995).

The spelling of 418181 in words is "four hundred eighteen thousand, one hundred eighty-one".