491509994 has 16 divisors (see below), whose sum is σ = 745030440. Its totient is φ = 243172800.

The previous prime is 491509979. The next prime is 491510003. The reversal of 491509994 is 499905194.

It can be written as a sum of positive squares in 4 ways, for example, as 291145969 + 200364025 = 17063^2 + 14155^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 282752 + ... + 284484.

Almost surely, 2^491509994 is an apocalyptic number.

491509994 is a deficient number, since it is larger than the sum of its proper divisors (253520446).

491509994 is a wasteful number, since it uses less digits than its factorization.

491509994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 491509994 is about 22170.0246729678. The cubic root of 491509994 is about 789.1825085155.

The spelling of 491509994 in words is "four hundred ninety-one million, five hundred nine thousand, nine hundred ninety-four".