51231052639 has 4 divisors (see below), whose sum is σ = 55171902856. Its totient is φ = 47290202424.

The previous prime is 51231052601. The next prime is 51231052657. The reversal of 51231052639 is 93625013215.

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 51231052639 - 2¹⁵ = 51231019871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51231052598 and 51231052607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51231052139) 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, 1970425089 + ... + 1970425114.

It is an arithmetic number, because the mean of its divisors is an integer number (13792975714).

Almost surely, 2^51231052639 is an apocalyptic number.

51231052639 is a deficient number, since it is larger than the sum of its proper divisors (3940850217).

51231052639 is a wasteful number, since it uses less digits than its factorization.

51231052639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940850216.

The product of its (nonzero) digits is 48600, while the sum is 37.

The spelling of 51231052639 in words is "fifty-one billion, two hundred thirty-one million, fifty-two thousand, six hundred thirty-nine".