491787522 has 18 divisors (see below), whose sum is σ = 1065743523. Its totient is φ = 163897812.

The previous prime is 491787511. The next prime is 491787523. The reversal of 491787522 is 225787194.

It is a happy number.

491787522 is a `hidden beast` number, since 49 + 1 + 7 + 87 + 522 = 666.

It can be written as a sum of positive squares in only one way, i.e., 245893761 + 245893761 = 15681^2 + 15681^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=15681.

It is not an unprimeable number, because it can be changed into a prime (491787523) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 91473 + ... + 96699.

Almost surely, 2^491787522 is an apocalyptic number.

491787522 is an abundant number, since it is smaller than the sum of its proper divisors (573956001).

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

491787522 is an frugal number, since it uses more digits than its factorization.

491787522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10462 (or 5232 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 491787522 is about 22176.2828715725. The cubic root of 491787522 is about 789.3310162000.

It can be divided in two parts, 49 and 1787522, that multiplied together give a palindrome (87588578).

The spelling of 491787522 in words is "four hundred ninety-one million, seven hundred eighty-seven thousand, five hundred twenty-two".