1000491 has 4 divisors (see below), whose sum is σ = 1333992. Its totient is φ = 666992.

The previous prime is 1000457. The next prime is 1000507. The reversal of 1000491 is 1940001.

1000491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1000491 - 2⁶ = 1000427 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1000491.

It is not an unprimeable number, because it can be changed into a prime (1000291) 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, 166746 + ... + 166751.

It is an arithmetic number, because the mean of its divisors is an integer number (333498).

2^1000491 is an apocalyptic number.

1000491 is a deficient number, since it is larger than the sum of its proper divisors (333501).

1000491 is an equidigital number, since it uses as much as digits as its factorization.

1000491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333500.

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

The square root of 1000491 is about 1000.2454698723. The cubic root of 1000491 is about 100.0163639887.

Adding to 1000491 its reverse (1940001), we get a palindrome (2940492).

The spelling of 1000491 in words is "one million, four hundred ninety-one", and thus it is an aban number.