1641161 has 2 divisors, whose sum is σ = 1641162. Its totient is φ = 1641160.

The previous prime is 1641137. The next prime is 1641217. The reversal of 1641161 is 1611461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 774400 = 931^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641161 - 2¹⁸ = 1379017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820580 + 820581.

It is an arithmetic number, because the mean of its divisors is an integer number (820581).

2^1641161 is an apocalyptic number.

It is an amenable number.

1641161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641161 is an equidigital number, since it uses as much as digits as its factorization.

1641161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

The square root of 1641161 is about 1281.0780616340. The cubic root of 1641161 is about 117.9551922185.

The spelling of 1641161 in words is "one million, six hundred forty-one thousand, one hundred sixty-one".