171161993 has 2 divisors, whose sum is σ = 171161994. Its totient is φ = 171161992.

The previous prime is 171161989. The next prime is 171162011. The reversal of 171161993 is 399161171.

171161993 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., 169702729 + 1459264 = 13027^2 + 1208^2 .

It is a cyclic number.

It is not a de Polignac number, because 171161993 - 2² = 171161989 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (171161923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85580996 + 85580997.

It is an arithmetic number, because the mean of its divisors is an integer number (85580997).

Almost surely, 2^171161993 is an apocalyptic number.

It is an amenable number.

171161993 is a deficient number, since it is larger than the sum of its proper divisors (1).

171161993 is an equidigital number, since it uses as much as digits as its factorization.

171161993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 38.

The square root of 171161993 is about 13082.8893215528. The cubic root of 171161993 is about 555.2251263191.

The spelling of 171161993 in words is "one hundred seventy-one million, one hundred sixty-one thousand, nine hundred ninety-three".