491597 has 4 divisors (see below), whose sum is σ = 493020. Its totient is φ = 490176.

The previous prime is 491593. The next prime is 491611. The reversal of 491597 is 795194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 795194 = 2 ⋅397597.

It can be written as a sum of positive squares in 2 ways, for example, as 292681 + 198916 = 541^2 + 446^2 .

It is a cyclic number.

It is not a de Polignac number, because 491597 - 2² = 491593 is a prime.

It is a super-2 number, since 2×491597² = 483335220818, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491591) 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, 179 + ... + 1007.

It is an arithmetic number, because the mean of its divisors is an integer number (123255).

2⁴⁹¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

491597 is a deficient number, since it is larger than the sum of its proper divisors (1423).

491597 is an equidigital number, since it uses as much as digits as its factorization.

491597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422.

The product of its digits is 11340, while the sum is 35.

The square root of 491597 is about 701.1397863479. The cubic root of 491597 is about 78.9229072209.

The spelling of 491597 in words is "four hundred ninety-one thousand, five hundred ninety-seven".