51061561500531 has 4 divisors (see below), whose sum is σ = 68082082000712. Its totient is φ = 34041041000352.

The previous prime is 51061561500497. The next prime is 51061561500569. The reversal of 51061561500531 is 13500516516015.

51061561500531 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 not a de Polignac number, because 51061561500531 - 2²³ = 51061553111923 is a prime.

It is a super-3 number, since 3×51061561500531³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 51061561500531.

It is not an unprimeable number, because it can be changed into a prime (51061561500031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8510260250086 + ... + 8510260250091.

It is an arithmetic number, because the mean of its divisors is an integer number (17020520500178).

Almost surely, 2^{51061561500531} is an apocalyptic number.

51061561500531 is a deficient number, since it is larger than the sum of its proper divisors (17020520500181).

51061561500531 is a wasteful number, since it uses less digits than its factorization.

51061561500531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17020520500180.

The product of its (nonzero) digits is 67500, while the sum is 39.

The spelling of 51061561500531 in words is "fifty-one trillion, sixty-one billion, five hundred sixty-one million, five hundred thousand, five hundred thirty-one".