1002891 has 4 divisors (see below), whose sum is σ = 1337192. Its totient is φ = 668592.

The previous prime is 1002887. The next prime is 1002893. The reversal of 1002891 is 1982001.

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

It is not a de Polignac number, because 1002891 - 2² = 1002887 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002893) 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, 167146 + ... + 167151.

It is an arithmetic number, because the mean of its divisors is an integer number (334298).

2^1002891 is an apocalyptic number.

1002891 is a deficient number, since it is larger than the sum of its proper divisors (334301).

1002891 is an equidigital number, since it uses as much as digits as its factorization.

1002891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334300.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1002891 is about 1001.4444567723. Note that the first 4 decimals coincide. The cubic root of 1002891 is about 100.0962739502.

Adding to 1002891 its reverse (1982001), we get a palindrome (2984892).

The spelling of 1002891 in words is "one million, two thousand, eight hundred ninety-one".