171903161 has 2 divisors, whose sum is σ = 171903162. Its totient is φ = 171903160.

The previous prime is 171903157. The next prime is 171903169. The reversal of 171903161 is 161309171.

171903161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 36529936 = 11635^2 + 6044^2 .

It is an emirp because it is prime and its reverse (161309171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171903161 - 2² = 171903157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171903169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85951580 + 85951581.

It is an arithmetic number, because the mean of its divisors is an integer number (85951581).

Almost surely, 2^171903161 is an apocalyptic number.

171903161 is the 5864-th centered decagonal number.

It is an amenable number.

171903161 is a deficient number, since it is larger than the sum of its proper divisors (1).

171903161 is an equidigital number, since it uses as much as digits as its factorization.

171903161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 171903161 is about 13111.1845765362. The cubic root of 171903161 is about 556.0253868038.

The spelling of 171903161 in words is "one hundred seventy-one million, nine hundred three thousand, one hundred sixty-one".