491605155 has 12 divisors (see below), whose sum is σ = 852115680. Its totient is φ = 262189392.

The previous prime is 491605139. The next prime is 491605171. The reversal of 491605155 is 551506194.

491605155 is a `hidden beast` number, since 49 + 1 + 605 + 1 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (491605139) and next prime (491605171).

It is not a de Polignac number, because 491605155 - 2⁴ = 491605139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5462235 + ... + 5462324.

It is an arithmetic number, because the mean of its divisors is an integer number (71009640).

Almost surely, 2^491605155 is an apocalyptic number.

491605155 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491605155 is a deficient number, since it is larger than the sum of its proper divisors (360510525).

491605155 is a wasteful number, since it uses less digits than its factorization.

491605155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10924570 (or 10924567 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 491605155 is about 22172.1707327000. The cubic root of 491605155 is about 789.2334363036.

The spelling of 491605155 in words is "four hundred ninety-one million, six hundred five thousand, one hundred fifty-five".