171145121 has 4 divisors (see below), whose sum is σ = 195594432. Its totient is φ = 146695812.

The previous prime is 171145097. The next prime is 171145123. The reversal of 171145121 is 121541171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121541171 = 193 ⋅629747.

It is a cyclic number.

It is not a de Polignac number, because 171145121 - 2⁶ = 171145057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171145123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12224645 + ... + 12224658.

It is an arithmetic number, because the mean of its divisors is an integer number (48898608).

Almost surely, 2^171145121 is an apocalyptic number.

It is an amenable number.

171145121 is a deficient number, since it is larger than the sum of its proper divisors (24449311).

171145121 is an equidigital number, since it uses as much as digits as its factorization.

171145121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24449310.

The product of its digits is 280, while the sum is 23.

The square root of 171145121 is about 13082.2444939697. The cubic root of 171145121 is about 555.2068822646.

Adding to 171145121 its reverse (121541171), we get a palindrome (292686292).

The spelling of 171145121 in words is "one hundred seventy-one million, one hundred forty-five thousand, one hundred twenty-one".