491929931808 has 192 divisors, whose sum is σ = 1643669879040. Its totient is φ = 140216832000.

The previous prime is 491929931803. The next prime is 491929931833. The reversal of 491929931808 is 808139929194.

491929931808 is a `hidden beast` number, since 49 + 192 + 99 + 318 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (491929931803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2449608 + ... + 2642808.

It is an arithmetic number, because the mean of its divisors is an integer number (8560780620).

Almost surely, 2^491929931808 is an apocalyptic number.

491929931808 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491929931808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821834939520).

491929931808 is an abundant number, since it is smaller than the sum of its proper divisors (1151739947232).

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

491929931808 is a wasteful number, since it uses less digits than its factorization.

491929931808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193648 (or 193634 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 491929931808 in words is "four hundred ninety-one billion, nine hundred twenty-nine million, nine hundred thirty-one thousand, eight hundred eight".