491231205 has 24 divisors (see below), whose sum is σ = 859742208. Its totient is φ = 259443936.

The previous prime is 491231197. The next prime is 491231219. The reversal of 491231205 is 502132194.

It is not a de Polignac number, because 491231205 - 2³ = 491231197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48357 + ... + 57626.

It is an arithmetic number, because the mean of its divisors is an integer number (35822592).

Almost surely, 2^491231205 is an apocalyptic number.

491231205 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491231205 is a deficient number, since it is larger than the sum of its proper divisors (368511003).

491231205 is a wasteful number, since it uses less digits than its factorization.

491231205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106097 (or 106094 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 491231205 is about 22163.7362599360. The cubic root of 491231205 is about 789.0332697638.

Adding to 491231205 its reverse (502132194), we get a palindrome (993363399).

The spelling of 491231205 in words is "four hundred ninety-one million, two hundred thirty-one thousand, two hundred five".