51513041123 has 4 divisors (see below), whose sum is σ = 51560258568. Its totient is φ = 51465823680.

The previous prime is 51513041077. The next prime is 51513041221. The reversal of 51513041123 is 32114031515.

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 51513041123 - 2¹² = 51513037027 is a prime.

It is a super-2 number, since 2×51513041123² (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 = 51513041092 and 51513041101.

It is not an unprimeable number, because it can be changed into a prime (51513041023) 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, 23607086 + ... + 23609267.

It is an arithmetic number, because the mean of its divisors is an integer number (12890064642).

Almost surely, 2^51513041123 is an apocalyptic number.

51513041123 is a deficient number, since it is larger than the sum of its proper divisors (47217445).

51513041123 is a wasteful number, since it uses less digits than its factorization.

51513041123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47217444.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 51513041123 its reverse (32114031515), we get a palindrome (83627072638).

The spelling of 51513041123 in words is "fifty-one billion, five hundred thirteen million, forty-one thousand, one hundred twenty-three".