172004232181 has 2 divisors, whose sum is σ = 172004232182. Its totient is φ = 172004232180.

The previous prime is 172004232167. The next prime is 172004232229. The reversal of 172004232181 is 181232400271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156618062500 + 15386169681 = 395750^2 + 124041^2 .

It is a cyclic number.

It is not a de Polignac number, because 172004232181 - 2¹⁷ = 172004101109 is a prime.

It is a super-2 number, since 2×172004232181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172004236181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86002116090 + 86002116091.

It is an arithmetic number, because the mean of its divisors is an integer number (86002116091).

Almost surely, 2^172004232181 is an apocalyptic number.

It is an amenable number.

172004232181 is a deficient number, since it is larger than the sum of its proper divisors (1).

172004232181 is an equidigital number, since it uses as much as digits as its factorization.

172004232181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The spelling of 172004232181 in words is "one hundred seventy-two billion, four million, two hundred thirty-two thousand, one hundred eighty-one".