491357139 has 16 divisors (see below), whose sum is σ = 806330112. Its totient is φ = 259177248.

The previous prime is 491357123. The next prime is 491357147. The reversal of 491357139 is 931753194.

It is not a de Polignac number, because 491357139 - 2⁴ = 491357123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491357139.

It is not an unprimeable number, because it can be changed into a prime (491357149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899649 + ... + 900194.

It is an arithmetic number, because the mean of its divisors is an integer number (50395632).

Almost surely, 2^491357139 is an apocalyptic number.

491357139 is a deficient number, since it is larger than the sum of its proper divisors (314972973).

491357139 is a wasteful number, since it uses less digits than its factorization.

491357139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799866.

The product of its digits is 102060, while the sum is 42.

The square root of 491357139 is about 22166.5770699944. The cubic root of 491357139 is about 789.1006905796.

The spelling of 491357139 in words is "four hundred ninety-one million, three hundred fifty-seven thousand, one hundred thirty-nine".