1004991 has 16 divisors (see below), whose sum is σ = 1466976. Its totient is φ = 608256.

The previous prime is 1004987. The next prime is 1005007. The reversal of 1004991 is 1994001.

It is not a de Polignac number, because 1004991 - 2² = 1004987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2671 + ... + 3023.

It is an arithmetic number, because the mean of its divisors is an integer number (91686).

2^1004991 is an apocalyptic number.

1004991 is a deficient number, since it is larger than the sum of its proper divisors (461985).

1004991 is a wasteful number, since it uses less digits than its factorization.

1004991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1004991 is about 1002.4923939861. The cubic root of 1004991 is about 100.1660906529.

Adding to 1004991 its reverse (1994001), we get a palindrome (2998992).

The spelling of 1004991 in words is "one million, four thousand, nine hundred ninety-one".