145105123 has 4 divisors (see below), whose sum is σ = 145536040. Its totient is φ = 144674208.

The previous prime is 145105117. The next prime is 145105127. The reversal of 145105123 is 321501541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321501541 = 41 ⋅7841501.

It is a cyclic number.

It is not a de Polignac number, because 145105123 - 2¹⁷ = 144974051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145105094 and 145105103.

It is not an unprimeable number, because it can be changed into a prime (145105127) 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, 214953 + ... + 215626.

It is an arithmetic number, because the mean of its divisors is an integer number (36384010).

Almost surely, 2^145105123 is an apocalyptic number.

145105123 is a deficient number, since it is larger than the sum of its proper divisors (430917).

145105123 is an equidigital number, since it uses as much as digits as its factorization.

145105123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430916.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 145105123 is about 12045.9587829280. The cubic root of 145105123 is about 525.4857158719.

Adding to 145105123 its reverse (321501541), we get a palindrome (466606664).

The spelling of 145105123 in words is "one hundred forty-five million, one hundred five thousand, one hundred twenty-three".