491223855 has 16 divisors (see below), whose sum is σ = 787267584. Its totient is φ = 261549600.

The previous prime is 491223847. The next prime is 491223893. The reversal of 491223855 is 558322194.

It is not a de Polignac number, because 491223855 - 2³ = 491223847 is a prime.

It is a super-2 number, since 2×491223855² = 482601751442122050, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 17871 + ... + 36080.

It is an arithmetic number, because the mean of its divisors is an integer number (49204224).

Almost surely, 2^491223855 is an apocalyptic number.

491223855 is a deficient number, since it is larger than the sum of its proper divisors (296043729).

491223855 is a wasteful number, since it uses less digits than its factorization.

491223855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54566.

The product of its digits is 86400, while the sum is 39.

The square root of 491223855 is about 22163.5704479220. The cubic root of 491223855 is about 789.0293344659.

The spelling of 491223855 in words is "four hundred ninety-one million, two hundred twenty-three thousand, eight hundred fifty-five".