499981491 has 12 divisors (see below), whose sum is σ = 748943832. Its totient is φ = 333320832.

The previous prime is 499981457. The next prime is 499981519. The reversal of 499981491 is 194189994.

499981491 is a `hidden beast` number, since 499 + 9 + 8 + 149 + 1 = 666.

It is not a de Polignac number, because 499981491 - 2⁹ = 499980979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499981451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1028526 + ... + 1029011.

It is an arithmetic number, because the mean of its divisors is an integer number (62411986).

Almost surely, 2^499981491 is an apocalyptic number.

499981491 is a deficient number, since it is larger than the sum of its proper divisors (248962341).

499981491 is an equidigital number, since it uses as much as digits as its factorization.

499981491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057552 (or 2057540 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 499981491 is about 22360.2658973457. The cubic root of 499981491 is about 793.6907321279.

The spelling of 499981491 in words is "four hundred ninety-nine million, nine hundred eighty-one thousand, four hundred ninety-one".