918081 has 16 divisors (see below), whose sum is σ = 1398400. Its totient is φ = 594864.

The previous prime is 918079. The next prime is 918089. The reversal of 918081 is 180819.

It is not a de Polignac number, because 918081 - 2¹ = 918079 is a prime.

It is a super-2 number, since 2×918081² = 1685745445122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

918081 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918081.

It is not an unprimeable number, because it can be changed into a prime (918089) 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, 540 + ... + 1458.

It is an arithmetic number, because the mean of its divisors is an integer number (87400).

2⁹¹⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

918081 is a deficient number, since it is larger than the sum of its proper divisors (480319).

918081 is a wasteful number, since it uses less digits than its factorization.

918081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 918081 is about 958.1654345675. The cubic root of 918081 is about 97.1912124353.

It can be divided in two parts, 91808 and 1, that added together give a square (91809 = 303²).

The spelling of 918081 in words is "nine hundred eighteen thousand, eighty-one".