51243013103 has 4 divisors (see below), whose sum is σ = 51306198888. Its totient is φ = 51179827320.

The previous prime is 51243013099. The next prime is 51243013111. The reversal of 51243013103 is 30131034215.

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 51243013103 - 2² = 51243013099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51243013123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31591676 + ... + 31593297.

It is an arithmetic number, because the mean of its divisors is an integer number (12826549722).

Almost surely, 2^51243013103 is an apocalyptic number.

51243013103 is a deficient number, since it is larger than the sum of its proper divisors (63185785).

51243013103 is an equidigital number, since it uses as much as digits as its factorization.

51243013103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63185784.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 51243013103 its reverse (30131034215), we get a palindrome (81374047318).

The spelling of 51243013103 in words is "fifty-one billion, two hundred forty-three million, thirteen thousand, one hundred three".