491211888654 has 32 divisors (see below), whose sum is σ = 985497198336. Its totient is φ = 163225782720.

The previous prime is 491211888641. The next prime is 491211888683. The reversal of 491211888654 is 456888112194.

It is a junction number, because it is equal to n+sod(n) for n = 491211888594 and 491211888603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2648209 + ... + 2827619.

It is an arithmetic number, because the mean of its divisors is an integer number (30796787448).

Almost surely, 2^491211888654 is an apocalyptic number.

491211888654 is an abundant number, since it is smaller than the sum of its proper divisors (494285309682).

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

491211888654 is a wasteful number, since it uses less digits than its factorization.

491211888654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180840.

The product of its digits is 4423680, while the sum is 57.

The spelling of 491211888654 in words is "four hundred ninety-one billion, two hundred eleven million, eight hundred eighty-eight thousand, six hundred fifty-four".