491990775 has 48 divisors (see below), whose sum is σ = 838592160. Its totient is φ = 254361600.

The previous prime is 491990753. The next prime is 491990789. The reversal of 491990775 is 577099194.

It is a happy number.

It is not a de Polignac number, because 491990775 - 2⁷ = 491990647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 593061 + ... + 593889.

It is an arithmetic number, because the mean of its divisors is an integer number (17470670).

Almost surely, 2^491990775 is an apocalyptic number.

491990775 is a deficient number, since it is larger than the sum of its proper divisors (346601385).

491990775 is a wasteful number, since it uses less digits than its factorization.

491990775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 51.

The square root of 491990775 is about 22180.8650642846. The cubic root of 491990775 is about 789.4397432367.

The spelling of 491990775 in words is "four hundred ninety-one million, nine hundred ninety thousand, seven hundred seventy-five".