491071812 has 96 divisors (see below), whose sum is σ = 1443563520. Its totient is φ = 126213120.

The previous prime is 491071811. The next prime is 491071813. The reversal of 491071812 is 218170194.

It is an interprime number because it is at equal distance from previous prime (491071811) and next prime (491071813).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (491071811) 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, 86889 + ... + 92367.

It is an arithmetic number, because the mean of its divisors is an integer number (15037120).

Almost surely, 2^491071812 is an apocalyptic number.

491071812 is a gapful number since it is divisible by the number (42) 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 491071812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721781760).

491071812 is an abundant number, since it is smaller than the sum of its proper divisors (952491708).

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

491071812 is a wasteful number, since it uses less digits than its factorization.

491071812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5601 (or 5599 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 491071812 is about 22160.1401620116. The cubic root of 491071812 is about 788.9479196043.

The spelling of 491071812 in words is "four hundred ninety-one million, seventy-one thousand, eight hundred twelve".