17900161 has 2 divisors, whose sum is σ = 17900162. Its totient is φ = 17900160.

The previous prime is 17900153. The next prime is 17900173. The reversal of 17900161 is 16100971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 1739761 = 4020^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 17900161 - 2³ = 17900153 is a prime.

It is not a weakly prime, because it can be changed into another prime (17900191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8950080 + 8950081.

It is an arithmetic number, because the mean of its divisors is an integer number (8950081).

Almost surely, 2^17900161 is an apocalyptic number.

It is an amenable number.

17900161 is a deficient number, since it is larger than the sum of its proper divisors (1).

17900161 is an equidigital number, since it uses as much as digits as its factorization.

17900161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 17900161 is about 4230.8581871767. The cubic root of 17900161 is about 261.5886996852.

The spelling of 17900161 in words is "seventeen million, nine hundred thousand, one hundred sixty-one".