30120173 has 2 divisors, whose sum is σ = 30120174. Its totient is φ = 30120172.

The previous prime is 30120169. The next prime is 30120191. The reversal of 30120173 is 37102103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15389929 + 14730244 = 3923^2 + 3838^2 .

It is an emirp because it is prime and its reverse (37102103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30120173 - 2² = 30120169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30120113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060086 + 15060087.

It is an arithmetic number, because the mean of its divisors is an integer number (15060087).

Almost surely, 2^30120173 is an apocalyptic number.

It is an amenable number.

30120173 is a deficient number, since it is larger than the sum of its proper divisors (1).

30120173 is an equidigital number, since it uses as much as digits as its factorization.

30120173 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 17.

The square root of 30120173 is about 5488.1848547584. The cubic root of 30120173 is about 311.1375927808.

Adding to 30120173 its reverse (37102103), we get a palindrome (67222276).

The spelling of 30120173 in words is "thirty million, one hundred twenty thousand, one hundred seventy-three".