51938679251 has 4 divisors (see below), whose sum is σ = 51984930312. Its totient is φ = 51892428192.

The previous prime is 51938679211. The next prime is 51938679269. The reversal of 51938679251 is 15297683915.

It is a happy number.

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 51938679251 - 2¹⁸ = 51938417107 is a prime.

It is a super-3 number, since 3×51938679251³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51938679211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23123846 + ... + 23126091.

It is an arithmetic number, because the mean of its divisors is an integer number (12996232578).

Almost surely, 2^51938679251 is an apocalyptic number.

51938679251 is a deficient number, since it is larger than the sum of its proper divisors (46251061).

51938679251 is a wasteful number, since it uses less digits than its factorization.

51938679251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46251060.

The product of its digits is 4082400, while the sum is 56.

The spelling of 51938679251 in words is "fifty-one billion, nine hundred thirty-eight million, six hundred seventy-nine thousand, two hundred fifty-one".