123515313523513 has 4 divisors (see below), whose sum is σ = 124403912901520. Its totient is φ = 122626714145508.

The previous prime is 123515313523453. The next prime is 123515313523517. The reversal of 123515313523513 is 315325313515321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123515313523513 is a prime.

It is a super-2 number, since 2×123515313523513² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123515313523513.

It is not an unprimeable number, because it can be changed into a prime (123515313523517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444299688795 + ... + 444299689072.

It is an arithmetic number, because the mean of its divisors is an integer number (31100978225380).

Almost surely, 2^{123515313523513} is an apocalyptic number.

It is an amenable number.

123515313523513 is a deficient number, since it is larger than the sum of its proper divisors (888599378007).

123515313523513 is an equidigital number, since it uses as much as digits as its factorization.

123515313523513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888599378006.

The product of its digits is 607500, while the sum is 43.

The spelling of 123515313523513 in words is "one hundred twenty-three trillion, five hundred fifteen billion, three hundred thirteen million, five hundred twenty-three thousand, five hundred thirteen".