618681 has 16 divisors (see below), whose sum is σ = 998784. Its totient is φ = 332544.

The previous prime is 618679. The next prime is 618703. The reversal of 618681 is 186816.

618681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 618681 - 2¹ = 618679 is a prime.

It is a super-2 number, since 2×618681² = 765532359522, which contains 22 as substring.

It is a Curzon 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 618681.

It is not an unprimeable number, because it can be changed into a prime (618671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (62424).

2⁶¹⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

618681 is a deficient number, since it is larger than the sum of its proper divisors (380103).

618681 is a wasteful number, since it uses less digits than its factorization.

618681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760.

The product of its digits is 2304, while the sum is 30.

The square root of 618681 is about 786.5627756257. The cubic root of 618681 is about 85.2096784174.

The spelling of 618681 in words is "six hundred eighteen thousand, six hundred eighty-one".