491001288 has 16 divisors (see below), whose sum is σ = 1227503280. Its totient is φ = 163667088.

The previous prime is 491001271. The next prime is 491001289. The reversal of 491001288 is 882100194.

It is not an unprimeable number, because it can be changed into a prime (491001289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10229170 + ... + 10229217.

It is an arithmetic number, because the mean of its divisors is an integer number (76718955).

Almost surely, 2^491001288 is an apocalyptic number.

It is an amenable number.

491001288 is an abundant number, since it is smaller than the sum of its proper divisors (736501992).

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

491001288 is a wasteful number, since it uses less digits than its factorization.

491001288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20458396 (or 20458392 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 491001288 is about 22158.5488694544. The cubic root of 491001288 is about 788.9101502289.

The spelling of 491001288 in words is "four hundred ninety-one million, one thousand, two hundred eighty-eight".