171005121 has 16 divisors (see below), whose sum is σ = 289532800. Its totient is φ = 97717104.

The previous prime is 171005113. The next prime is 171005171. The reversal of 171005121 is 121500171.

It is a happy number.

It is not a de Polignac number, because 171005121 - 2³ = 171005113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171005094 and 171005103.

It is not an unprimeable number, because it can be changed into a prime (171005171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452206 + ... + 452583.

It is an arithmetic number, because the mean of its divisors is an integer number (18095800).

Almost surely, 2^171005121 is an apocalyptic number.

It is an amenable number.

171005121 is a deficient number, since it is larger than the sum of its proper divisors (118527679).

171005121 is an equidigital number, since it uses as much as digits as its factorization.

171005121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904805 (or 904799 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 171005121 is about 13076.8926354849. The cubic root of 171005121 is about 555.0554509972.

Adding to 171005121 its reverse (121500171), we get a palindrome (292505292).

The spelling of 171005121 in words is "one hundred seventy-one million, five thousand, one hundred twenty-one".