173086421 has 2 divisors, whose sum is σ = 173086422. Its totient is φ = 173086420.

The previous prime is 173086391. The next prime is 173086439. The reversal of 173086421 is 124680371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171898321 + 1188100 = 13111^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 173086421 - 2¹⁰ = 173085397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173086451) 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, 86543210 + 86543211.

It is an arithmetic number, because the mean of its divisors is an integer number (86543211).

Almost surely, 2^173086421 is an apocalyptic number.

It is an amenable number.

173086421 is a deficient number, since it is larger than the sum of its proper divisors (1).

173086421 is an equidigital number, since it uses as much as digits as its factorization.

173086421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 173086421 is about 13156.2312612693. The cubic root of 173086421 is about 557.2982328710.

The spelling of 173086421 in words is "one hundred seventy-three million, eighty-six thousand, four hundred twenty-one".