51381851173 has 2 divisors, whose sum is σ = 51381851174. Its totient is φ = 51381851172.

The previous prime is 51381851021. The next prime is 51381851179. The reversal of 51381851173 is 37115818315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28015060129 + 23366791044 = 167377^2 + 152862^2 .

It is a cyclic number.

It is not a de Polignac number, because 51381851173 - 2³³ = 42791916581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51381851179) 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 as a sum of consecutive naturals, namely, 25690925586 + 25690925587.

It is an arithmetic number, because the mean of its divisors is an integer number (25690925587).

Almost surely, 2^51381851173 is an apocalyptic number.

It is an amenable number.

51381851173 is a deficient number, since it is larger than the sum of its proper divisors (1).

51381851173 is an equidigital number, since it uses as much as digits as its factorization.

51381851173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 43.

The spelling of 51381851173 in words is "fifty-one billion, three hundred eighty-one million, eight hundred fifty-one thousand, one hundred seventy-three".