491999358 has 16 divisors (see below), whose sum is σ = 998686080. Its totient is φ = 161551896.

The previous prime is 491999353. The next prime is 491999359. The reversal of 491999358 is 853999194.

It is a junction number, because it is equal to n+sod(n) for n = 491999298 and 491999307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491999351) 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, 611538 + ... + 612341.

It is an arithmetic number, because the mean of its divisors is an integer number (62417880).

Almost surely, 2^491999358 is an apocalyptic number.

491999358 is an abundant number, since it is smaller than the sum of its proper divisors (506686722).

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

491999358 is a wasteful number, since it uses less digits than its factorization.

491999358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223951.

The product of its digits is 3149280, while the sum is 57.

The square root of 491999358 is about 22181.0585410165. The cubic root of 491999358 is about 789.4443339203. Note that the first 3 decimals are identical.

The spelling of 491999358 in words is "four hundred ninety-one million, nine hundred ninety-nine thousand, three hundred fifty-eight".