491545872 has 30 divisors (see below), whose sum is σ = 1375646142. Its totient is φ = 163848576.

The previous prime is 491545849. The next prime is 491545877. The reversal of 491545872 is 278545194.

It can be written as a sum of positive squares in only one way, i.e., 452157696 + 39388176 = 21264^2 + 6276^2 .

It is not an unprimeable number, because it can be changed into a prime (491545877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1706613 + ... + 1706900.

Almost surely, 2^491545872 is an apocalyptic number.

It is an amenable number.

491545872 is an abundant number, since it is smaller than the sum of its proper divisors (884100270).

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

491545872 is a wasteful number, since it uses less digits than its factorization.

491545872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413527 (or 3413518 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 491545872 is about 22170.8338138195. The cubic root of 491545872 is about 789.2017102960.

The spelling of 491545872 in words is "four hundred ninety-one million, five hundred forty-five thousand, eight hundred seventy-two".