491712505 has 8 divisors (see below), whose sum is σ = 624764232. Its totient is φ = 370230528.

The previous prime is 491712503. The next prime is 491712509. The reversal of 491712505 is 505217194.

It can be written as a sum of positive squares in 4 ways, for example, as 9339136 + 482373369 = 3056^2 + 21963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491712505 - 2¹ = 491712503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491712503) 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, 2892342 + ... + 2892511.

It is an arithmetic number, because the mean of its divisors is an integer number (78095529).

Almost surely, 2^491712505 is an apocalyptic number.

It is an amenable number.

491712505 is a deficient number, since it is larger than the sum of its proper divisors (133051727).

491712505 is a wasteful number, since it uses less digits than its factorization.

491712505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784875.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 491712505 is about 22174.5914280286. The cubic root of 491712505 is about 789.2908794517.

Adding to 491712505 its reverse (505217194), we get a palindrome (996929699).

The spelling of 491712505 in words is "four hundred ninety-one million, seven hundred twelve thousand, five hundred five".