618831 has 12 divisors (see below), whose sum is σ = 925080. Its totient is φ = 398160.

The previous prime is 618823. The next prime is 618833. The reversal of 618831 is 138816.

It is not a de Polignac number, because 618831 - 2³ = 618823 is a prime.

It is a super-2 number, since 2×618831² = 765903613122, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

618831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 618795 and 618804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925 + ... + 1446.

It is an arithmetic number, because the mean of its divisors is an integer number (77090).

2⁶¹⁸⁸³¹ is an apocalyptic number.

618831 is a deficient number, since it is larger than the sum of its proper divisors (306249).

618831 is a wasteful number, since it uses less digits than its factorization.

618831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406 (or 2403 counting only the distinct ones).

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

The square root of 618831 is about 786.6581214225. The cubic root of 618831 is about 85.2165642594.

The spelling of 618831 in words is "six hundred eighteen thousand, eight hundred thirty-one".