123111110513 has 4 divisors (see below), whose sum is σ = 124845069888. Its totient is φ = 121377151140.

The previous prime is 123111110491. The next prime is 123111110539. The reversal of 123111110513 is 315011111321.

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: 315011111321 = 89 ⋅3539450689.

It is not a de Polignac number, because 123111110513 - 2⁶ = 123111110449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123111110543) 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, 866979581 + ... + 866979722.

It is an arithmetic number, because the mean of its divisors is an integer number (31211267472).

Almost surely, 2^123111110513 is an apocalyptic number.

It is an amenable number.

123111110513 is a deficient number, since it is larger than the sum of its proper divisors (1733959375).

123111110513 is an equidigital number, since it uses as much as digits as its factorization.

123111110513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733959374.

The product of its (nonzero) digits is 90, while the sum is 20.

Adding to 123111110513 its reverse (315011111321), we get a palindrome (438122221834).

The spelling of 123111110513 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred ten thousand, five hundred thirteen".