74521 has 2 divisors, whose sum is σ = 74522. Its totient is φ = 74520.
The previous prime is 74509. The next prime is 74527. The reversal of 74521 is 12547.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 68121 + 6400 = 261^2 + 80^2 .
It is an emirp because it is prime and its reverse (12547) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 74521 - 25 = 74489 is a prime.
It is a Chen prime.
It is an Ulam number.
It is an alternating number because its digits alternate between odd and even.
It is not a weakly prime, because it can be changed into another prime (74527) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37260 + 37261.
It is an arithmetic number, because the mean of its divisors is an integer number (37261).
274521 is an apocalyptic number.
It is an amenable number.
74521 is a deficient number, since it is larger than the sum of its proper divisors (1).
74521 is an equidigital number, since it uses as much as digits as its factorization.
74521 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 280, while the sum is 19.
The square root of 74521 is about 272.9853475921. The cubic root of 74521 is about 42.0816627336.
It can be divided in two parts, 74 and 521, that added together give a palindrome (595).
The spelling of 74521 in words is "seventy-four thousand, five hundred twenty-one".
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