15493 has 2 divisors, whose sum is σ = 15494. Its totient is φ = 15492.
The previous prime is 15473. The next prime is 15497. The reversal of 15493 is 39451.
15493 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 9409 + 6084 = 97^2 + 78^2 .
It is an emirp because it is prime and its reverse (39451) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 15493 - 25 = 15461 is a prime.
It is a plaindrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (15497) 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, 7746 + 7747.
It is an arithmetic number, because the mean of its divisors is an integer number (7747).
215493 is an apocalyptic number.
It is an amenable number.
15493 is a deficient number, since it is larger than the sum of its proper divisors (1).
15493 is an equidigital number, since it uses as much as digits as its factorization.
15493 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 540, while the sum is 22.
The square root of 15493 is about 124.4708801286. The cubic root of 15493 is about 24.9294008179.
The spelling of 15493 in words is "fifteen thousand, four hundred ninety-three".
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