491008847 has 4 divisors (see below), whose sum is σ = 561152976. Its totient is φ = 420864720.

The previous prime is 491008813. The next prime is 491008867. The reversal of 491008847 is 748800194.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 491008847 - 2¹² = 491004751 is a prime.

It is a super-4 number, since 4×491008847⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491008867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35072054 + ... + 35072067.

It is an arithmetic number, because the mean of its divisors is an integer number (140288244).

Almost surely, 2^491008847 is an apocalyptic number.

491008847 is a deficient number, since it is larger than the sum of its proper divisors (70144129).

491008847 is an equidigital number, since it uses as much as digits as its factorization.

491008847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70144128.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 491008847 is about 22158.7194350215. The cubic root of 491008847 is about 788.9141986509.

The spelling of 491008847 in words is "four hundred ninety-one million, eight thousand, eight hundred forty-seven".