818149 has 4 divisors (see below), whose sum is σ = 821440. Its totient is φ = 814860.

The previous prime is 818143. The next prime is 818171. The reversal of 818149 is 941818.

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 818149 - 2⁷ = 818021 is a prime.

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

It is a Duffinian number.

818149 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 818149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1239 + ... + 1780.

It is an arithmetic number, because the mean of its divisors is an integer number (205360).

2⁸¹⁸¹⁴⁹ is an apocalyptic number.

It is an amenable number.

818149 is a deficient number, since it is larger than the sum of its proper divisors (3291).

818149 is a wasteful number, since it uses less digits than its factorization.

818149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290.

The product of its digits is 2304, while the sum is 31.

The square root of 818149 is about 904.5158926188. The cubic root of 818149 is about 93.5285356200.

The spelling of 818149 in words is "eight hundred eighteen thousand, one hundred forty-nine".