189512173 has 2 divisors, whose sum is σ = 189512174. Its totient is φ = 189512172.

The previous prime is 189512171. The next prime is 189512201. The reversal of 189512173 is 371215981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156300004 + 33212169 = 12502^2 + 5763^2 .

It is a cyclic number.

It is not a de Polignac number, because 189512173 - 2¹ = 189512171 is a prime.

Together with 189512171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189512171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94756086 + 94756087.

It is an arithmetic number, because the mean of its divisors is an integer number (94756087).

Almost surely, 2^189512173 is an apocalyptic number.

It is an amenable number.

189512173 is a deficient number, since it is larger than the sum of its proper divisors (1).

189512173 is an equidigital number, since it uses as much as digits as its factorization.

189512173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 37.

The square root of 189512173 is about 13766.3420341062. The cubic root of 189512173 is about 574.3972744188.

The spelling of 189512173 in words is "one hundred eighty-nine million, five hundred twelve thousand, one hundred seventy-three".