171885949 has 2 divisors, whose sum is σ = 171885950. Its totient is φ = 171885948.

The previous prime is 171885911. The next prime is 171885971. The reversal of 171885949 is 949588171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158306724 + 13579225 = 12582^2 + 3685^2 .

It is a cyclic number.

It is not a de Polignac number, because 171885949 - 2⁹ = 171885437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171885896 and 171885905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171883949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85942974 + 85942975.

It is an arithmetic number, because the mean of its divisors is an integer number (85942975).

Almost surely, 2^171885949 is an apocalyptic number.

It is an amenable number.

171885949 is a deficient number, since it is larger than the sum of its proper divisors (1).

171885949 is an equidigital number, since it uses as much as digits as its factorization.

171885949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 52.

The square root of 171885949 is about 13110.5281739524. The cubic root of 171885949 is about 556.0068286258.

The spelling of 171885949 in words is "one hundred seventy-one million, eight hundred eighty-five thousand, nine hundred forty-nine".