491617502904 has 64 divisors (see below), whose sum is σ = 1411342128000. Its totient is φ = 141134209920.

The previous prime is 491617502903. The next prime is 491617502911. The reversal of 491617502904 is 409205716194.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491617502903) 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 15 ways as a sum of consecutive naturals, for example, 48999919 + ... + 49009950.

It is an arithmetic number, because the mean of its divisors is an integer number (22052220750).

Almost surely, 2^491617502904 is an apocalyptic number.

491617502904 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

491617502904 is an abundant number, since it is smaller than the sum of its proper divisors (919724625096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491617502904 is a wasteful number, since it uses less digits than its factorization.

491617502904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98009908 (or 98009904 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 491617502904 in words is "four hundred ninety-one billion, six hundred seventeen million, five hundred two thousand, nine hundred four".