618491 has 4 divisors (see below), whose sum is σ = 626400. Its totient is φ = 610584.

The previous prime is 618463. The next prime is 618509. The reversal of 618491 is 194816.

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 618491 - 2¹⁰ = 617467 is a prime.

It is a super-2 number, since 2×618491² = 765062234162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (618421) 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, 3836 + ... + 3993.

It is an arithmetic number, because the mean of its divisors is an integer number (156600).

2⁶¹⁸⁴⁹¹ is an apocalyptic number.

618491 is a deficient number, since it is larger than the sum of its proper divisors (7909).

618491 is an equidigital number, since it uses as much as digits as its factorization.

618491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7908.

The product of its digits is 1728, while the sum is 29.

The square root of 618491 is about 786.4419876889. The cubic root of 618491 is about 85.2009547528.

The spelling of 618491 in words is "six hundred eighteen thousand, four hundred ninety-one".