173031121 has 2 divisors, whose sum is σ = 173031122. Its totient is φ = 173031120.

The previous prime is 173031109. The next prime is 173031143. The reversal of 173031121 is 121130371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129140496 + 43890625 = 11364^2 + 6625^2 .

It is an emirp because it is prime and its reverse (121130371) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 173031121 - 2¹³ = 173022929 is a prime.

It is not a weakly prime, because it can be changed into another prime (173031191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86515560 + 86515561.

It is an arithmetic number, because the mean of its divisors is an integer number (86515561).

Almost surely, 2^173031121 is an apocalyptic number.

It is an amenable number.

173031121 is a deficient number, since it is larger than the sum of its proper divisors (1).

173031121 is an equidigital number, since it uses as much as digits as its factorization.

173031121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 173031121 is about 13154.1294276740. The cubic root of 173031121 is about 557.2388754802.

Adding to 173031121 its reverse (121130371), we get a palindrome (294161492).

The spelling of 173031121 in words is "one hundred seventy-three million, thirty-one thousand, one hundred twenty-one".