491030100 has 324 divisors, whose sum is σ = 1764907872. Its totient is φ = 118324800.

The previous prime is 491030081. The next prime is 491030101. The reversal of 491030100 is 1030194.

It is a tau number, because it is divible by the number of its divisors (324).

It is a super-2 number, since 2×491030100² = 482221118212020000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491030101) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 2940217 + ... + 2940383.

Almost surely, 2^491030100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491030100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882453936).

491030100 is an abundant number, since it is smaller than the sum of its proper divisors (1273877772).

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

491030100 is a wasteful number, since it uses less digits than its factorization.

491030100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 491030100 is about 22159.1989927434. The cubic root of 491030100 is about 788.9255810334.

Adding to 491030100 its reverse (1030194), we get a palindrome (492060294).

The spelling of 491030100 in words is "four hundred ninety-one million, thirty thousand, one hundred".