51135853117 has 2 divisors, whose sum is σ = 51135853118. Its totient is φ = 51135853116.

The previous prime is 51135853099. The next prime is 51135853159. The reversal of 51135853117 is 71135853115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32597941401 + 18537911716 = 180549^2 + 136154^2 .

It is a cyclic number.

It is not a de Polignac number, because 51135853117 - 2³⁵ = 16776114749 is a prime.

It is a super-2 number, since 2×51135853117² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51135853117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51135853177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25567926558 + 25567926559.

It is an arithmetic number, because the mean of its divisors is an integer number (25567926559).

Almost surely, 2^51135853117 is an apocalyptic number.

It is an amenable number.

51135853117 is a deficient number, since it is larger than the sum of its proper divisors (1).

51135853117 is an equidigital number, since it uses as much as digits as its factorization.

51135853117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 40.

The spelling of 51135853117 in words is "fifty-one billion, one hundred thirty-five million, eight hundred fifty-three thousand, one hundred seventeen".