51020851117 has 8 divisors (see below), whose sum is σ = 52815893760. Its totient is φ = 49235134080.

The previous prime is 51020851111. The next prime is 51020851139. The reversal of 51020851117 is 71115802015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51020851117 - 2³ = 51020851109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020851111) 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 7 ways as a sum of consecutive naturals, for example, 2320267 + ... + 2342152.

It is an arithmetic number, because the mean of its divisors is an integer number (6601986720).

Almost surely, 2^51020851117 is an apocalyptic number.

It is an amenable number.

51020851117 is a deficient number, since it is larger than the sum of its proper divisors (1795042643).

51020851117 is a wasteful number, since it uses less digits than its factorization.

51020851117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662803.

The product of its (nonzero) digits is 2800, while the sum is 31.

The spelling of 51020851117 in words is "fifty-one billion, twenty million, eight hundred fifty-one thousand, one hundred seventeen".