491509460 has 36 divisors (see below), whose sum is σ = 1117682748. Its totient is φ = 181479168.

The previous prime is 491509453. The next prime is 491509493. The reversal of 491509460 is 64905194.

It can be written as a sum of positive squares in 6 ways, for example, as 6012304 + 485497156 = 2452^2 + 22034^2 .

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 69329 + ... + 76088.

It is an arithmetic number, because the mean of its divisors is an integer number (31046743).

Almost surely, 2^491509460 is an apocalyptic number.

It is an amenable number.

491509460 is an abundant number, since it is smaller than the sum of its proper divisors (626173288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491509460 is a wasteful number, since it uses less digits than its factorization.

491509460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145452 (or 145437 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 491509460 is about 22170.0126296762. The cubic root of 491509460 is about 789.1822227135.

The spelling of 491509460 in words is "four hundred ninety-one million, five hundred nine thousand, four hundred sixty".