73121 has 2 divisors, whose sum is σ = 73122. Its totient is φ = 73120.
The previous prime is 73091. The next prime is 73127. The reversal of 73121 is 12137.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 46225 + 26896 = 215^2 + 164^2 .
It is a cyclic number.
It is not a de Polignac number, because 73121 - 214 = 56737 is a prime.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 73096 and 73105.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 73121.
It is not a weakly prime, because it can be changed into another prime (73127) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36560 + 36561.
It is an arithmetic number, because the mean of its divisors is an integer number (36561).
273121 is an apocalyptic number.
It is an amenable number.
73121 is a deficient number, since it is larger than the sum of its proper divisors (1).
73121 is an equidigital number, since it uses as much as digits as its factorization.
73121 is an evil number, because the sum of its binary digits is even.
The product of its digits is 42, while the sum is 14.
The square root of 73121 is about 270.4089495560. The cubic root of 73121 is about 41.8164705435.
Adding to 73121 its reverse (12137), we get a palindrome (85258).
It can be divided in two parts, 731 and 21, that multiplied together give a palindrome (15351).
The spelling of 73121 in words is "seventy-three thousand, one hundred twenty-one", and thus it is an iban number.
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