123663145 has 4 divisors (see below), whose sum is σ = 148395780. Its totient is φ = 98930512.

The previous prime is 123663143. The next prime is 123663149. The reversal of 123663145 is 541366321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541366321 = 73 ⋅7415977.

It can be written as a sum of positive squares in 2 ways, for example, as 53304601 + 70358544 = 7301^2 + 8388^2 .

It is a cyclic number.

It is not a de Polignac number, because 123663145 - 2¹ = 123663143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123663143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12366310 + ... + 12366319.

It is an arithmetic number, because the mean of its divisors is an integer number (37098945).

Almost surely, 2^123663145 is an apocalyptic number.

It is an amenable number.

123663145 is a deficient number, since it is larger than the sum of its proper divisors (24732635).

123663145 is an equidigital number, since it uses as much as digits as its factorization.

123663145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24732634.

The product of its digits is 12960, while the sum is 31.

The square root of 123663145 is about 11120.3932034798. The cubic root of 123663145 is about 498.2111342177.

The spelling of 123663145 in words is "one hundred twenty-three million, six hundred sixty-three thousand, one hundred forty-five".