51103400123 has 4 divisors (see below), whose sum is σ = 51677595720. Its totient is φ = 50529204528.

The previous prime is 51103400039. The next prime is 51103400213. The reversal of 51103400123 is 32100430115.

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

It is a cyclic number.

It is not a de Polignac number, because 51103400123 - 2²⁴ = 51086622907 is a prime.

It is a super-2 number, since 2×51103400123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51103400095 and 51103400104.

It is not an unprimeable number, because it can be changed into a prime (51103400323) 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, 287097665 + ... + 287097842.

It is an arithmetic number, because the mean of its divisors is an integer number (12919398930).

Almost surely, 2^51103400123 is an apocalyptic number.

51103400123 is a deficient number, since it is larger than the sum of its proper divisors (574195597).

51103400123 is an equidigital number, since it uses as much as digits as its factorization.

51103400123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574195596.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 51103400123 its reverse (32100430115), we get a palindrome (83203830238).

The spelling of 51103400123 in words is "fifty-one billion, one hundred three million, four hundred thousand, one hundred twenty-three".