172082321 has 2 divisors, whose sum is σ = 172082322. Its totient is φ = 172082320.

The previous prime is 172082299. The next prime is 172082357. The reversal of 172082321 is 123280271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 6574096 = 12865^2 + 2564^2 .

It is an emirp because it is prime and its reverse (123280271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172082321 is a prime.

It is a super-2 number, since 2×172082321² = 59224650401494082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172085321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86041160 + 86041161.

It is an arithmetic number, because the mean of its divisors is an integer number (86041161).

Almost surely, 2^172082321 is an apocalyptic number.

It is an amenable number.

172082321 is a deficient number, since it is larger than the sum of its proper divisors (1).

172082321 is an equidigital number, since it uses as much as digits as its factorization.

172082321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 172082321 is about 13118.0151318711. The cubic root of 172082321 is about 556.2184856783.

The spelling of 172082321 in words is "one hundred seventy-two million, eighty-two thousand, three hundred twenty-one".