491678855 has 4 divisors (see below), whose sum is σ = 590014632. Its totient is φ = 393343080.

The previous prime is 491678839. The next prime is 491678893. The reversal of 491678855 is 558876194.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 491678855 - 2⁴ = 491678839 is a prime.

It is a super-2 number, since 2×491678855² = 483496192908222050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491678797 and 491678806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49167881 + ... + 49167890.

It is an arithmetic number, because the mean of its divisors is an integer number (147503658).

Almost surely, 2^491678855 is an apocalyptic number.

491678855 is a deficient number, since it is larger than the sum of its proper divisors (98335777).

491678855 is an equidigital number, since it uses as much as digits as its factorization.

491678855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98335776.

The product of its digits is 2419200, while the sum is 53.

The square root of 491678855 is about 22173.8326637503. The cubic root of 491678855 is about 789.2728741853.

The spelling of 491678855 in words is "four hundred ninety-one million, six hundred seventy-eight thousand, eight hundred fifty-five".