123512232513 has 4 divisors (see below), whose sum is σ = 164682976688. Its totient is φ = 82341488340.

The previous prime is 123512232509. The next prime is 123512232533. The reversal of 123512232513 is 315232215321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 315232215321 = 3 ⋅105077405107.

It is not a de Polignac number, because 123512232513 - 2² = 123512232509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123512232533) 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, 20585372083 + ... + 20585372088.

It is an arithmetic number, because the mean of its divisors is an integer number (41170744172).

Almost surely, 2^123512232513 is an apocalyptic number.

It is an amenable number.

123512232513 is a deficient number, since it is larger than the sum of its proper divisors (41170744175).

123512232513 is an equidigital number, since it uses as much as digits as its factorization.

123512232513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41170744174.

The product of its digits is 10800, while the sum is 30.

Adding to 123512232513 its reverse (315232215321), we get a palindrome (438744447834).

The spelling of 123512232513 in words is "one hundred twenty-three billion, five hundred twelve million, two hundred thirty-two thousand, five hundred thirteen".