123149 has 4 divisors (see below), whose sum is σ = 132636. Its totient is φ = 113664.

The previous prime is 123143. The next prime is 123169. The reversal of 123149 is 941321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941321 = 23 ⋅40927.

It can be written as a sum of positive squares in 2 ways, for example, as 75625 + 47524 = 275^2 + 218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123149.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 123149.

It is not an unprimeable number, because it can be changed into a prime (123143) 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, 4724 + ... + 4749.

It is an arithmetic number, because the mean of its divisors is an integer number (33159).

2¹²³¹⁴⁹ is an apocalyptic number.

It is an amenable number.

123149 is a deficient number, since it is larger than the sum of its proper divisors (9487).

123149 is an equidigital number, since it uses as much as digits as its factorization.

123149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486.

The product of its digits is 216, while the sum is 20.

The square root of 123149 is about 350.9259181081. The cubic root of 123149 is about 49.7519716734.

It can be divided in two parts, 123 and 149, that added together give a palindrome (272).

The spelling of 123149 in words is "one hundred twenty-three thousand, one hundred forty-nine".