51017121173 has 2 divisors, whose sum is σ = 51017121174. Its totient is φ = 51017121172.

The previous prime is 51017121151. The next prime is 51017121203. The reversal of 51017121173 is 37112171015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50950421284 + 66699889 = 225722^2 + 8167^2 .

It is a cyclic number.

It is not a de Polignac number, because 51017121173 - 2⁶ = 51017121109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51017121373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25508560586 + 25508560587.

It is an arithmetic number, because the mean of its divisors is an integer number (25508560587).

Almost surely, 2^51017121173 is an apocalyptic number.

It is an amenable number.

51017121173 is a deficient number, since it is larger than the sum of its proper divisors (1).

51017121173 is an equidigital number, since it uses as much as digits as its factorization.

51017121173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1470, while the sum is 29.

Adding to 51017121173 its reverse (37112171015), we get a palindrome (88129292188).

The spelling of 51017121173 in words is "fifty-one billion, seventeen million, one hundred twenty-one thousand, one hundred seventy-three".