918491 has 4 divisors (see below), whose sum is σ = 1049712. Its totient is φ = 787272.

The previous prime is 918481. The next prime is 918497. The reversal of 918491 is 194819.

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

It is a cyclic number.

It is not a de Polignac number, because 918491 - 2¹⁸ = 656347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (918497) 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 3 ways as a sum of consecutive naturals, for example, 65600 + ... + 65613.

It is an arithmetic number, because the mean of its divisors is an integer number (262428).

2⁹¹⁸⁴⁹¹ is an apocalyptic number.

918491 is a deficient number, since it is larger than the sum of its proper divisors (131221).

918491 is a wasteful number, since it uses less digits than its factorization.

918491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131220.

The product of its digits is 2592, while the sum is 32.

The square root of 918491 is about 958.3793612135. The cubic root of 918491 is about 97.2056782855.

The spelling of 918491 in words is "nine hundred eighteen thousand, four hundred ninety-one".