818631 has 12 divisors (see below), whose sum is σ = 1290120. Its totient is φ = 496080.

The previous prime is 818621. The next prime is 818659. The reversal of 818631 is 136818.

It is not a de Polignac number, because 818631 - 2¹⁷ = 687559 is a prime.

It is a super-2 number, since 2×818631² = 1340313428322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 818595 and 818604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818621) 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 11 ways as a sum of consecutive naturals, for example, 4036 + ... + 4233.

It is an arithmetic number, because the mean of its divisors is an integer number (107510).

2⁸¹⁸⁶³¹ is an apocalyptic number.

818631 is a deficient number, since it is larger than the sum of its proper divisors (471489).

818631 is a wasteful number, since it uses less digits than its factorization.

818631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8286 (or 8283 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 818631 is about 904.7822942565. The cubic root of 818631 is about 93.5468989842.

The spelling of 818631 in words is "eight hundred eighteen thousand, six hundred thirty-one".