491888539 has 4 divisors (see below), whose sum is σ = 491946520. Its totient is φ = 491830560.

The previous prime is 491888513. The next prime is 491888569. The reversal of 491888539 is 935888194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 491888539 - 2¹⁷ = 491757467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491888539.

It is not an unprimeable number, because it can be changed into a prime (491888569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13509 + ... + 34150.

It is an arithmetic number, because the mean of its divisors is an integer number (122986630).

Almost surely, 2^491888539 is an apocalyptic number.

491888539 is a deficient number, since it is larger than the sum of its proper divisors (57981).

491888539 is a wasteful number, since it uses less digits than its factorization.

491888539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57980.

The product of its digits is 2488320, while the sum is 55.

The square root of 491888539 is about 22178.5603455229. The cubic root of 491888539 is about 789.3850574196.

The spelling of 491888539 in words is "four hundred ninety-one million, eight hundred eighty-eight thousand, five hundred thirty-nine".