491678455 has 4 divisors (see below), whose sum is σ = 590014152. Its totient is φ = 393342760.

The previous prime is 491678449. The next prime is 491678489. The reversal of 491678455 is 554876194.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554876194 = 2 ⋅277438097.

It is not a de Polignac number, because 491678455 - 2⁵ = 491678423 is a prime.

It is a super-2 number, since 2×491678455² = 483495406222374050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491678399 and 491678408.

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 3 ways as a sum of consecutive naturals, for example, 49167841 + ... + 49167850.

It is an arithmetic number, because the mean of its divisors is an integer number (147503538).

Almost surely, 2^491678455 is an apocalyptic number.

491678455 is a deficient number, since it is larger than the sum of its proper divisors (98335697).

491678455 is an equidigital number, since it uses as much as digits as its factorization.

491678455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98335696.

The product of its digits is 1209600, while the sum is 49.

The square root of 491678455 is about 22173.8236441079. The cubic root of 491678455 is about 789.2726601504.

The spelling of 491678455 in words is "four hundred ninety-one million, six hundred seventy-eight thousand, four hundred fifty-five".