491690023854 has 32 divisors (see below), whose sum is σ = 990095853600. Its totient is φ = 162777631872.

The previous prime is 491690023823. The next prime is 491690023859. The reversal of 491690023854 is 458320096194.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 491690023797 and 491690023806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491690023859) 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, 9031764 + ... + 9086040.

It is an arithmetic number, because the mean of its divisors is an integer number (30940495425).

Almost surely, 2^491690023854 is an apocalyptic number.

491690023854 is an abundant number, since it is smaller than the sum of its proper divisors (498405829746).

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

491690023854 is a wasteful number, since it uses less digits than its factorization.

491690023854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64564.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 491690023854 in words is "four hundred ninety-one billion, six hundred ninety million, twenty-three thousand, eight hundred fifty-four".