491635659 has 8 divisors (see below), whose sum is σ = 690015040. Its totient is φ = 310506696.

The previous prime is 491635657. The next prime is 491635691. The reversal of 491635659 is 956536194.

It is a happy number.

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

It is not a de Polignac number, because 491635659 - 2¹ = 491635657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491635657) 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, 4312537 + ... + 4312650.

It is an arithmetic number, because the mean of its divisors is an integer number (86251880).

Almost surely, 2^491635659 is an apocalyptic number.

491635659 is a deficient number, since it is larger than the sum of its proper divisors (198379381).

491635659 is a wasteful number, since it uses less digits than its factorization.

491635659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8625209.

The product of its digits is 874800, while the sum is 48.

The square root of 491635659 is about 22172.8586113744. The cubic root of 491635659 is about 789.2497598908.

It can be divided in two parts, 491635 and 659, that added together give a palindrome (492294).

The spelling of 491635659 in words is "four hundred ninety-one million, six hundred thirty-five thousand, six hundred fifty-nine".