491860131839 has 4 divisors (see below), whose sum is σ = 491967272160. Its totient is φ = 491752991520.

The previous prime is 491860131817. The next prime is 491860131857. The reversal of 491860131839 is 938131068194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491860131839 - 2²⁰ = 491859083263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491860131899) 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, 53563274 + ... + 53572455.

It is an arithmetic number, because the mean of its divisors is an integer number (122991818040).

Almost surely, 2^491860131839 is an apocalyptic number.

491860131839 is a deficient number, since it is larger than the sum of its proper divisors (107140321).

491860131839 is a wasteful number, since it uses less digits than its factorization.

491860131839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107140320.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 491860131839 in words is "four hundred ninety-one billion, eight hundred sixty million, one hundred thirty-one thousand, eight hundred thirty-nine".