491997359 has 4 divisors (see below), whose sum is σ = 562282704. Its totient is φ = 421712016.

The previous prime is 491997353. The next prime is 491997409. The reversal of 491997359 is 953799194.

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 491997359 - 2¹⁶ = 491931823 is a prime.

It is a super-2 number, since 2×491997359² = 484122802525949762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491997353) 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, 35142662 + ... + 35142675.

It is an arithmetic number, because the mean of its divisors is an integer number (140570676).

Almost surely, 2^491997359 is an apocalyptic number.

491997359 is a deficient number, since it is larger than the sum of its proper divisors (70285345).

491997359 is an equidigital number, since it uses as much as digits as its factorization.

491997359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70285344.

The product of its digits is 2755620, while the sum is 56.

The square root of 491997359 is about 22181.0134800013. The cubic root of 491997359 is about 789.4432647446.

The spelling of 491997359 in words is "four hundred ninety-one million, nine hundred ninety-seven thousand, three hundred fifty-nine".