491163786 has 12 divisors (see below), whose sum is σ = 1064188242. Its totient is φ = 163721256.

The previous prime is 491163733. The next prime is 491163791. The reversal of 491163786 is 687361194.

It is a happy number.

491163786 is a `hidden beast` number, since 4 + 9 + 1 + 1 + 637 + 8 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 446688225 + 44475561 = 21135^2 + 6669^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13643421 + ... + 13643456.

Almost surely, 2^491163786 is an apocalyptic number.

491163786 is an abundant number, since it is smaller than the sum of its proper divisors (573024456).

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

491163786 is a wasteful number, since it uses less digits than its factorization.

491163786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27286885 (or 27286882 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 491163786 is about 22162.2152773589. The cubic root of 491163786 is about 788.9971711696.

The spelling of 491163786 in words is "four hundred ninety-one million, one hundred sixty-three thousand, seven hundred eighty-six".