173440121 has 2 divisors, whose sum is σ = 173440122. Its totient is φ = 173440120.

The previous prime is 173440063. The next prime is 173440123. The reversal of 173440121 is 121044371.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146773225 + 26666896 = 12115^2 + 5164^2 .

It is a cyclic number.

It is not a de Polignac number, because 173440121 - 2¹⁴ = 173423737 is a prime.

Together with 173440123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (173440123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86720060 + 86720061.

It is an arithmetic number, because the mean of its divisors is an integer number (86720061).

Almost surely, 2^173440121 is an apocalyptic number.

It is an amenable number.

173440121 is a deficient number, since it is larger than the sum of its proper divisors (1).

173440121 is an equidigital number, since it uses as much as digits as its factorization.

173440121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 173440121 is about 13169.6667004143. Note that the first 3 decimals coincide. The cubic root of 173440121 is about 557.6775853119.

Adding to 173440121 its reverse (121044371), we get a palindrome (294484492).

The spelling of 173440121 in words is "one hundred seventy-three million, four hundred forty thousand, one hundred twenty-one".