172321 has 2 divisors, whose sum is σ = 172322. Its totient is φ = 172320.
The previous prime is 172313. The next prime is 172331. The reversal of 172321 is 123271.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 160000 + 12321 = 400^2 + 111^2 .
It is a cyclic number.
It is not a de Polignac number, because 172321 - 23 = 172313 is a prime.
172321 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 172295 and 172304.
It is not a weakly prime, because it can be changed into another prime (172331) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86160 + 86161.
It is an arithmetic number, because the mean of its divisors is an integer number (86161).
2172321 is an apocalyptic number.
It is an amenable number.
172321 is a deficient number, since it is larger than the sum of its proper divisors (1).
172321 is an equidigital number, since it uses as much as digits as its factorization.
172321 is an evil number, because the sum of its binary digits is even.
The product of its digits is 84, while the sum is 16.
The square root of 172321 is about 415.1156465372. The cubic root of 172321 is about 55.6475526107.
Adding to 172321 its reverse (123271), we get a palindrome (295592).
The spelling of 172321 in words is "one hundred seventy-two thousand, three hundred twenty-one", and thus it is an iban number.
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