1002161 has 4 divisors (see below), whose sum is σ = 1004400. Its totient is φ = 999924.

The previous prime is 1002151. The next prime is 1002173. The reversal of 1002161 is 1612001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1002101) 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, 191 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (251100).

2^1002161 is an apocalyptic number.

It is an amenable number.

1002161 is a deficient number, since it is larger than the sum of its proper divisors (2239).

1002161 is an equidigital number, since it uses as much as digits as its factorization.

1002161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1002161 is about 1001.0799168898. The cubic root of 1002161 is about 100.0719815075.

Adding to 1002161 its reverse (1612001), we get a palindrome (2614162).

The spelling of 1002161 in words is "one million, two thousand, one hundred sixty-one".