1802161 has 4 divisors (see below), whose sum is σ = 1822500. Its totient is φ = 1781824.

The previous prime is 1802149. The next prime is 1802189. The reversal of 1802161 is 1612081.

1802161 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1612081 = 29 ⋅55589.

It can be written as a sum of positive squares in 2 ways, for example, as 435600 + 1366561 = 660^2 + 1169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1802161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1802261) 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, 10036 + ... + 10213.

It is an arithmetic number, because the mean of its divisors is an integer number (455625).

2^1802161 is an apocalyptic number.

It is an amenable number.

1802161 is a deficient number, since it is larger than the sum of its proper divisors (20339).

1802161 is an equidigital number, since it uses as much as digits as its factorization.

1802161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20338.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 1802161 is about 1342.4459020758. The cubic root of 1802161 is about 121.6927005860.

The spelling of 1802161 in words is "one million, eight hundred two thousand, one hundred sixty-one".