7549 has 2 divisors, whose sum is σ = 7550.
Its totient is φ = 7548.
The previous prime is 7547. The next prime is 7559. The reversal of 7549 is 9457.
It can be divided in two parts, 754 and 9, that multiplied together give a triangular number (6786 = T116).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 7225 + 324 = 85^2 + 18^2
It is a cyclic number.
It is not a de Polignac number, because 7549 - 21 = 7547 is a prime.
Together with 7547, it forms a pair of twin primes.
7549 is a lucky number.
It is a plaindrome in base 13.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (7541) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3774 + 3775.
It is an arithmetic number, because the mean of its divisors is an integer number (3775).
It is an amenable number.
7549 is a deficient number, since it is larger than the sum of its proper divisors (1).
7549 is an equidigital number, since it uses as much as digits as its factorization.
7549 is an evil number, because the sum of its binary digits is even.
The product of its digits is 1260, while the sum is 25.
The square root of 7549 is about 86.8849814410.
The cubic root of 7549 is about 19.6168742646.
The spelling of 7549 in words is "seven thousand, five hundred forty-nine".