171971101 has 2 divisors, whose sum is σ = 171971102. Its totient is φ = 171971100.

The previous prime is 171971087. The next prime is 171971117. The reversal of 171971101 is 101179171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112911876 + 59059225 = 10626^2 + 7685^2 .

It is a cyclic number.

It is not a de Polignac number, because 171971101 - 2¹¹ = 171969053 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171971101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171971141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85985550 + 85985551.

It is an arithmetic number, because the mean of its divisors is an integer number (85985551).

Almost surely, 2^171971101 is an apocalyptic number.

It is an amenable number.

171971101 is a deficient number, since it is larger than the sum of its proper divisors (1).

171971101 is an equidigital number, since it uses as much as digits as its factorization.

171971101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 441, while the sum is 28.

The square root of 171971101 is about 13113.7752382752. The cubic root of 171971101 is about 556.0986284068.

The spelling of 171971101 in words is "one hundred seventy-one million, nine hundred seventy-one thousand, one hundred one".