491019205 has 4 divisors (see below), whose sum is σ = 589223052. Its totient is φ = 392815360.

The previous prime is 491019197. The next prime is 491019229. The reversal of 491019205 is 502910194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 328660641 + 162358564 = 18129^2 + 12742^2 .

It is not a de Polignac number, because 491019205 - 2³ = 491019197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49101916 + ... + 49101925.

It is an arithmetic number, because the mean of its divisors is an integer number (147305763).

Almost surely, 2^491019205 is an apocalyptic number.

It is an amenable number.

491019205 is a deficient number, since it is larger than the sum of its proper divisors (98203847).

491019205 is an equidigital number, since it uses as much as digits as its factorization.

491019205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98203846.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 491019205 is about 22158.9531566814. The cubic root of 491019205 is about 788.9197460837.

Adding to 491019205 its reverse (502910194), we get a palindrome (993929399).

The spelling of 491019205 in words is "four hundred ninety-one million, nineteen thousand, two hundred five".