51018239 has 2 divisors, whose sum is σ = 51018240. Its totient is φ = 51018238.

The previous prime is 51018229. The next prime is 51018263. The reversal of 51018239 is 93281015.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51018239 is a prime.

It is a super-2 number, since 2×51018239² = 5205721421322242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51018229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25509119 + 25509120.

It is an arithmetic number, because the mean of its divisors is an integer number (25509120).

Almost surely, 2^51018239 is an apocalyptic number.

51018239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51018239 is an equidigital number, since it uses as much as digits as its factorization.

51018239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 51018239 is about 7142.7052998146. The cubic root of 51018239 is about 370.8871795339.

The spelling of 51018239 in words is "fifty-one million, eighteen thousand, two hundred thirty-nine".