51135839 has 2 divisors, whose sum is σ = 51135840. Its totient is φ = 51135838.

The previous prime is 51135827. The next prime is 51135853. The reversal of 51135839 is 93853115.

51135839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51135839 - 2⁴ = 51135823 is a prime.

It is a super-2 number, since 2×51135839² = 5229748060467842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51135799 and 51135808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51135809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25567919 + 25567920.

It is an arithmetic number, because the mean of its divisors is an integer number (25567920).

Almost surely, 2^51135839 is an apocalyptic number.

51135839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51135839 is an equidigital number, since it uses as much as digits as its factorization.

51135839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 51135839 is about 7150.9327363638. The cubic root of 51135839 is about 371.1719330083.

The spelling of 51135839 in words is "fifty-one million, one hundred thirty-five thousand, eight hundred thirty-nine".