491992271185 has 16 divisors (see below), whose sum is σ = 591459477840. Its totient is φ = 392881674240.

The previous prime is 491992271179. The next prime is 491992271203. The reversal of 491992271185 is 581172299194.

It can be written as a sum of positive squares in 8 ways, for example, as 4943214864 + 487049056321 = 70308^2 + 697889^2 .

It is not a de Polignac number, because 491992271185 - 2¹¹ = 491992269137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12119001 + ... + 12159529.

It is an arithmetic number, because the mean of its divisors is an integer number (36966217365).

Almost surely, 2^491992271185 is an apocalyptic number.

It is an amenable number.

491992271185 is a deficient number, since it is larger than the sum of its proper divisors (99467206655).

491992271185 is a wasteful number, since it uses less digits than its factorization.

491992271185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44868.

The product of its digits is 3265920, while the sum is 58.

The spelling of 491992271185 in words is "four hundred ninety-one billion, nine hundred ninety-two million, two hundred seventy-one thousand, one hundred eighty-five".