51240043039 has 4 divisors (see below), whose sum is σ = 51283801720. Its totient is φ = 51196284360.

The previous prime is 51240043021. The next prime is 51240043051. The reversal of 51240043039 is 93034004215.

51240043039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51240043039 - 2⁷ = 51240042911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51240043039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51240043079) 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, 21877584 + ... + 21879925.

It is an arithmetic number, because the mean of its divisors is an integer number (12820950430).

Almost surely, 2^51240043039 is an apocalyptic number.

51240043039 is a deficient number, since it is larger than the sum of its proper divisors (43758681).

51240043039 is a wasteful number, since it uses less digits than its factorization.

51240043039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43758680.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 51240043039 in words is "fifty-one billion, two hundred forty million, forty-three thousand, thirty-nine".