123549 has 4 divisors (see below), whose sum is σ = 164736. Its totient is φ = 82364.

The previous prime is 123547. The next prime is 123551. The reversal of 123549 is 945321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (123547) and next prime (123551).

It is a cyclic number.

It is not a de Polignac number, because 123549 - 2¹ = 123547 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20589 + ... + 20594.

It is an arithmetic number, because the mean of its divisors is an integer number (41184).

2¹²³⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

123549 is a deficient number, since it is larger than the sum of its proper divisors (41187).

123549 is an equidigital number, since it uses as much as digits as its factorization.

123549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41186.

The product of its digits is 1080, while the sum is 24.

The square root of 123549 is about 351.4953769255. The cubic root of 123549 is about 49.8057798811.

The spelling of 123549 in words is "one hundred twenty-three thousand, five hundred forty-nine".