51891134804 has 24 divisors (see below), whose sum is σ = 93958137000. Its totient is φ = 25046282240.

The previous prime is 51891134797. The next prime is 51891134807. The reversal of 51891134804 is 40843119815.

It can be written as a sum of positive squares in 4 ways, for example, as 116683204 + 51774451600 = 10802^2 + 227540^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51891134807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640244 + ... + 716724.

It is an arithmetic number, because the mean of its divisors is an integer number (3914922375).

Almost surely, 2^51891134804 is an apocalyptic number.

It is an amenable number.

51891134804 is a deficient number, since it is larger than the sum of its proper divisors (42067002196).

51891134804 is a wasteful number, since it uses less digits than its factorization.

51891134804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82363 (or 82361 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 51891134804 in words is "fifty-one billion, eight hundred ninety-one million, one hundred thirty-four thousand, eight hundred four".