491873858 has 24 divisors (see below), whose sum is σ = 865884492. Its totient is φ = 208932864.

The previous prime is 491873849. The next prime is 491873873. The reversal of 491873858 is 858378194.

It can be written as a sum of positive squares in 2 ways, for example, as 318872449 + 173001409 = 17857^2 + 13153^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11135 + ... + 33282.

Almost surely, 2^491873858 is an apocalyptic number.

491873858 is a deficient number, since it is larger than the sum of its proper divisors (374010634).

491873858 is a wasteful number, since it uses less digits than its factorization.

491873858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44546 (or 44539 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The square root of 491873858 is about 22178.2293702631. The cubic root of 491873858 is about 789.3772039620.

The spelling of 491873858 in words is "four hundred ninety-one million, eight hundred seventy-three thousand, eight hundred fifty-eight".