491286555 has 48 divisors (see below), whose sum is σ = 912674880. Its totient is φ = 243834624.

The previous prime is 491286547. The next prime is 491286577. The reversal of 491286555 is 555682194.

491286555 is a `hidden beast` number, since 4 + 9 + 12 + 86 + 555 = 666.

It is not a de Polignac number, because 491286555 - 2³ = 491286547 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 491286555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31881 + ... + 44709.

It is an arithmetic number, because the mean of its divisors is an integer number (19014060).

Almost surely, 2^491286555 is an apocalyptic number.

491286555 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491286555 is a deficient number, since it is larger than the sum of its proper divisors (421388325).

491286555 is a wasteful number, since it uses less digits than its factorization.

491286555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12900 (or 12897 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 491286555 is about 22164.9848860765. The cubic root of 491286555 is about 789.0629037060.

The spelling of 491286555 in words is "four hundred ninety-one million, two hundred eighty-six thousand, five hundred fifty-five".