2188506161 has 2 divisors, whose sum is σ = 2188506162. Its totient is φ = 2188506160.

The previous prime is 2188506139. The next prime is 2188506179. The reversal of 2188506161 is 1616058812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1989160000 + 199346161 = 44600^2 + 14119^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188506161 - 2¹⁴ = 2188489777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2188506121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094253080 + 1094253081.

It is an arithmetic number, because the mean of its divisors is an integer number (1094253081).

Almost surely, 2^2188506161 is an apocalyptic number.

It is an amenable number.

2188506161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188506161 is an equidigital number, since it uses as much as digits as its factorization.

2188506161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 2188506161 is about 46781.4724116289. The cubic root of 2188506161 is about 1298.3225229579.

The spelling of 2188506161 in words is "two billion, one hundred eighty-eight million, five hundred six thousand, one hundred sixty-one".