491808195 has 48 divisors (see below), whose sum is σ = 892120320. Its totient is φ = 250164288.

The previous prime is 491808173. The next prime is 491808199. The reversal of 491808195 is 591808194.

491808195 is a `hidden beast` number, since 491 + 80 + 81 + 9 + 5 = 666.

It is not a de Polignac number, because 491808195 - 2¹³ = 491800003 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 491808195.

It is not an unprimeable number, because it can be changed into a prime (491808199) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 665136 + ... + 665874.

It is an arithmetic number, because the mean of its divisors is an integer number (18585840).

Almost surely, 2^491808195 is an apocalyptic number.

491808195 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

491808195 is a deficient number, since it is larger than the sum of its proper divisors (400312125).

491808195 is a wasteful number, since it uses less digits than its factorization.

491808195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 491808195 is about 22176.7489727417. The cubic root of 491808195 is about 789.3420762687.

Subtracting 491808195 from its reverse (591808194), we obtain a palindrome (99999999).

It can be divided in two parts, 49180 and 8195, that added together give a palindrome (57375).

The spelling of 491808195 in words is "four hundred ninety-one million, eight hundred eight thousand, one hundred ninety-five".