491501689 has 8 divisors (see below), whose sum is σ = 569628288. Its totient is φ = 415353120.

The previous prime is 491501687. The next prime is 491501693. The reversal of 491501689 is 986105194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491501689 - 2¹ = 491501687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491501687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493972 + ... + 494965.

It is an arithmetic number, because the mean of its divisors is an integer number (71203536).

Almost surely, 2^491501689 is an apocalyptic number.

It is an amenable number.

491501689 is a deficient number, since it is larger than the sum of its proper divisors (78126599).

491501689 is an equidigital number, since it uses as much as digits as its factorization.

491501689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989015.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 491501689 is about 22169.8373697238. The cubic root of 491501689 is about 789.1780635752.

The spelling of 491501689 in words is "four hundred ninety-one million, five hundred one thousand, six hundred eighty-nine".