123515013 has 24 divisors (see below), whose sum is σ = 178872192. Its totient is φ = 75516544.

The previous prime is 123515011. The next prime is 123515023. The reversal of 123515013 is 310515321.

It is not a de Polignac number, because 123515013 - 2¹ = 123515011 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123515011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544006 + ... + 544232.

It is an arithmetic number, because the mean of its divisors is an integer number (7453008).

Almost surely, 2^123515013 is an apocalyptic number.

It is an amenable number.

123515013 is a deficient number, since it is larger than the sum of its proper divisors (55357179).

123515013 is an equidigital number, since it uses as much as digits as its factorization.

123515013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 123515013 is about 11113.7308317234. The cubic root of 123515013 is about 498.0121245092.

The spelling of 123515013 in words is "one hundred twenty-three million, five hundred fifteen thousand, thirteen".