123015505 has 4 divisors (see below), whose sum is σ = 147618612. Its totient is φ = 98412400.

The previous prime is 123015493. The next prime is 123015511. The reversal of 123015505 is 505510321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 93779856 + 29235649 = 9684^2 + 5407^2 .

It is not a de Polignac number, because 123015505 - 2⁹ = 123014993 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12301546 + ... + 12301555.

It is an arithmetic number, because the mean of its divisors is an integer number (36904653).

Almost surely, 2^123015505 is an apocalyptic number.

It is an amenable number.

123015505 is a deficient number, since it is larger than the sum of its proper divisors (24603107).

123015505 is an equidigital number, since it uses as much as digits as its factorization.

123015505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24603106.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 123015505 is about 11091.2355037660. The cubic root of 123015505 is about 497.3398792804.

Adding to 123015505 its reverse (505510321), we get a palindrome (628525826).

The spelling of 123015505 in words is "one hundred twenty-three million, fifteen thousand, five hundred five".