618881 has 4 divisors (see below), whose sum is σ = 630612. Its totient is φ = 607152.

The previous prime is 618869. The next prime is 618883. The reversal of 618881 is 188816.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 490000 + 128881 = 700^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 618881 - 2¹⁰ = 617857 is a prime.

It is a super-2 number, since 2×618881² = 766027384322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (618883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5786 + ... + 5891.

It is an arithmetic number, because the mean of its divisors is an integer number (157653).

2⁶¹⁸⁸⁸¹ is an apocalyptic number.

It is an amenable number.

618881 is a deficient number, since it is larger than the sum of its proper divisors (11731).

618881 is a wasteful number, since it uses less digits than its factorization.

618881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11730.

The product of its digits is 3072, while the sum is 32.

The square root of 618881 is about 786.6899007868. The cubic root of 618881 is about 85.2188592928.

The spelling of 618881 in words is "six hundred eighteen thousand, eight hundred eighty-one".