1800605161 has 2 divisors, whose sum is σ = 1800605162. Its totient is φ = 1800605160.

The previous prime is 1800605143. The next prime is 1800605171. The reversal of 1800605161 is 1615060081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1798184025 + 2421136 = 42405^2 + 1556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800605161 - 2¹³ = 1800596969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1800605141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900302580 + 900302581.

It is an arithmetic number, because the mean of its divisors is an integer number (900302581).

Almost surely, 2^1800605161 is an apocalyptic number.

It is an amenable number.

1800605161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800605161 is an equidigital number, since it uses as much as digits as its factorization.

1800605161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1800605161 is about 42433.5381626373. The cubic root of 1800605161 is about 1216.5767064863.

The spelling of 1800605161 in words is "one billion, eight hundred million, six hundred five thousand, one hundred sixty-one".