491531264 has 88 divisors (see below), whose sum is σ = 1147630080. Its totient is φ = 206032896.

The previous prime is 491531263. The next prime is 491531269. The reversal of 491531264 is 462135194.

It is not an unprimeable number, because it can be changed into a prime (491531263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336167 + ... + 337625.

Almost surely, 2^491531264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491531264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573815040).

491531264 is an abundant number, since it is smaller than the sum of its proper divisors (656098816).

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

491531264 is a wasteful number, since it uses less digits than its factorization.

491531264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533 (or 1515 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The square root of 491531264 is about 22170.5043695447. The cubic root of 491531264 is about 789.1938922581.

The spelling of 491531264 in words is "four hundred ninety-one million, five hundred thirty-one thousand, two hundred sixty-four".