245123 has 4 divisors (see below), whose sum is σ = 259560. Its totient is φ = 230688.

The previous prime is 245107. The next prime is 245129. The reversal of 245123 is 321542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245123 - 2⁴ = 245107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 14419 = 245123 / (2 + 4 + 5 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7193 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (64890).

2²⁴⁵¹²³ is an apocalyptic number.

245123 is a deficient number, since it is larger than the sum of its proper divisors (14437).

245123 is a wasteful number, since it uses less digits than its factorization.

245123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14436.

The product of its digits is 240, while the sum is 17.

The square root of 245123 is about 495.0989800030. The cubic root of 245123 is about 62.5837171463.

Adding to 245123 its reverse (321542), we get a palindrome (566665).

It can be divided in two parts, 24512 and 3, that multiplied together give a triangular number (73536 = T₃₈₃).

The spelling of 245123 in words is "two hundred forty-five thousand, one hundred twenty-three".