491475521 has 8 divisors (see below), whose sum is σ = 498401280. Its totient is φ = 484591392.

The previous prime is 491475461. The next prime is 491475539. The reversal of 491475521 is 125574194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491475521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491475221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13760 + ... + 34238.

It is an arithmetic number, because the mean of its divisors is an integer number (62300160).

Almost surely, 2^491475521 is an apocalyptic number.

It is an amenable number.

491475521 is a deficient number, since it is larger than the sum of its proper divisors (6925759).

491475521 is a wasteful number, since it uses less digits than its factorization.

491475521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20815.

The product of its digits is 50400, while the sum is 38.

The square root of 491475521 is about 22169.2471906468. The cubic root of 491475521 is about 789.1640578057.

The spelling of 491475521 in words is "four hundred ninety-one million, four hundred seventy-five thousand, five hundred twenty-one".