51912531938 has 16 divisors (see below), whose sum is σ = 81894205440. Its totient is φ = 24632235936.

The previous prime is 51912531919. The next prime is 51912531973. The reversal of 51912531938 is 83913521915.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51912531892 and 51912531901.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4437203 + ... + 4448886.

It is an arithmetic number, because the mean of its divisors is an integer number (5118387840).

Almost surely, 2^51912531938 is an apocalyptic number.

51912531938 is a deficient number, since it is larger than the sum of its proper divisors (29981673502).

51912531938 is a wasteful number, since it uses less digits than its factorization.

51912531938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8886241.

The product of its digits is 291600, while the sum is 47.

The spelling of 51912531938 in words is "fifty-one billion, nine hundred twelve million, five hundred thirty-one thousand, nine hundred thirty-eight".