491805259 has 16 divisors (see below), whose sum is σ = 549997056. Its totient is φ = 435996000.

The previous prime is 491805211. The next prime is 491805263. The reversal of 491805259 is 952508194.

It is not a de Polignac number, because 491805259 - 2⁷ = 491805131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491805269) 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, 71134 + ... + 77740.

It is an arithmetic number, because the mean of its divisors is an integer number (34374816).

Almost surely, 2^491805259 is an apocalyptic number.

491805259 is a deficient number, since it is larger than the sum of its proper divisors (58191797).

491805259 is a wasteful number, since it uses less digits than its factorization.

491805259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 491805259 is about 22176.6827771874. The cubic root of 491805259 is about 789.3405055257.

The spelling of 491805259 in words is "four hundred ninety-one million, eight hundred five thousand, two hundred fifty-nine".