1662161 has 2 divisors, whose sum is σ = 1662162. Its totient is φ = 1662160.

The previous prime is 1662149. The next prime is 1662163. The reversal of 1662161 is 1612661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 913936 + 748225 = 956^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662161 - 2¹⁰ = 1661137 is a prime.

It is a Sophie Germain prime.

Together with 1662163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1662163) 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 as a sum of consecutive naturals, namely, 831080 + 831081.

It is an arithmetic number, because the mean of its divisors is an integer number (831081).

2^1662161 is an apocalyptic number.

It is an amenable number.

1662161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662161 is an equidigital number, since it uses as much as digits as its factorization.

1662161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 1662161 is about 1289.2482305592. The cubic root of 1662161 is about 118.4561725560.

The spelling of 1662161 in words is "one million, six hundred sixty-two thousand, one hundred sixty-one".