491243500 has 48 divisors (see below), whose sum is σ = 1170423072. Its totient is φ = 178632000.

The previous prime is 491243491. The next prime is 491243513. The reversal of 491243500 is 5342194.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39159 + ... + 50158.

It is an arithmetic number, because the mean of its divisors is an integer number (24383814).

Almost surely, 2^491243500 is an apocalyptic number.

It is an amenable number.

491243500 is an abundant number, since it is smaller than the sum of its proper divisors (679179572).

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

491243500 is a wasteful number, since it uses less digits than its factorization.

491243500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89347 (or 89335 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 491243500 is about 22164.0136256951. The cubic root of 491243500 is about 789.0398525997.

Adding to 491243500 its reverse (5342194), we get a palindrome (496585694).

The spelling of 491243500 in words is "four hundred ninety-one million, two hundred forty-three thousand, five hundred".