491997230898 has 16 divisors (see below), whose sum is σ = 984084792960. Its totient is φ = 163984021776.

The previous prime is 491997230891. The next prime is 491997230939. The reversal of 491997230898 is 898032799194.

It is a super-2 number, since 2×491997230898² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491997230891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3692890 + ... + 3823797.

It is an arithmetic number, because the mean of its divisors is an integer number (61505299560).

Almost surely, 2^491997230898 is an apocalyptic number.

491997230898 is an abundant number, since it is smaller than the sum of its proper divisors (492087562062).

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

491997230898 is a wasteful number, since it uses less digits than its factorization.

491997230898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527601.

The product of its (nonzero) digits is 70543872, while the sum is 69.

The spelling of 491997230898 in words is "four hundred ninety-one billion, nine hundred ninety-seven million, two hundred thirty thousand, eight hundred ninety-eight".