10000491 has 4 divisors (see below), whose sum is σ = 13333992. Its totient is φ = 6666992.

The previous prime is 10000481. The next prime is 10000511. The reversal of 10000491 is 19400001.

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 10000491 - 2⁷ = 10000363 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10000491.

It is not an unprimeable number, because it can be changed into a prime (10000451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666746 + ... + 1666751.

It is an arithmetic number, because the mean of its divisors is an integer number (3333498).

Almost surely, 2^10000491 is an apocalyptic number.

10000491 is a deficient number, since it is larger than the sum of its proper divisors (3333501).

10000491 is an equidigital number, since it uses as much as digits as its factorization.

10000491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3333500.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 10000491 is about 3162.3552931320. The cubic root of 10000491 is about 215.4469950369.

Adding to 10000491 its reverse (19400001), we get a palindrome (29400492).

The spelling of 10000491 in words is "ten million, four hundred ninety-one", and thus it is an aban number.