1002991 has 8 divisors (see below), whose sum is σ = 1152000. Its totient is φ = 863640.

The previous prime is 1002979. The next prime is 1003001. The reversal of 1002991 is 1992001.

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 1002991 - 2⁷ = 1002863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002931) 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, 2191 + ... + 2608.

It is an arithmetic number, because the mean of its divisors is an integer number (144000).

2^1002991 is an apocalyptic number.

1002991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1002991 is a deficient number, since it is larger than the sum of its proper divisors (149009).

1002991 is a wasteful number, since it uses less digits than its factorization.

1002991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4829.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1002991 is about 1001.4943834091. The cubic root of 1002991 is about 100.0996007639.

Adding to 1002991 its reverse (1992001), we get a palindrome (2994992).

The spelling of 1002991 in words is "one million, two thousand, nine hundred ninety-one".