491634743506 has 8 divisors (see below), whose sum is σ = 737457047424. Its totient is φ = 245815727700.

The previous prime is 491634743471. The next prime is 491634743507. The reversal of 491634743506 is 605347436194.

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

It is not an unprimeable number, because it can be changed into a prime (491634743507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406150 + ... + 1071553.

It is an arithmetic number, because the mean of its divisors is an integer number (92182130928).

Almost surely, 2^491634743506 is an apocalyptic number.

491634743506 is a deficient number, since it is larger than the sum of its proper divisors (245822303918).

491634743506 is a wasteful number, since it uses less digits than its factorization.

491634743506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644056.

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 491634743506 in words is "four hundred ninety-one billion, six hundred thirty-four million, seven hundred forty-three thousand, five hundred six".