172573189 has 2 divisors, whose sum is σ = 172573190. Its totient is φ = 172573188.

The previous prime is 172573169. The next prime is 172573201. The reversal of 172573189 is 981375271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 7064964 = 12865^2 + 2658^2 .

It is an emirp because it is prime and its reverse (981375271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172573189 - 2²⁵ = 139018757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172573109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86286594 + 86286595.

It is an arithmetic number, because the mean of its divisors is an integer number (86286595).

Almost surely, 2^172573189 is an apocalyptic number.

It is an amenable number.

172573189 is a deficient number, since it is larger than the sum of its proper divisors (1).

172573189 is an equidigital number, since it uses as much as digits as its factorization.

172573189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 172573189 is about 13136.7114986971. The cubic root of 172573189 is about 556.7468581013.

The spelling of 172573189 in words is "one hundred seventy-two million, five hundred seventy-three thousand, one hundred eighty-nine".