51636839 has 2 divisors, whose sum is σ = 51636840. Its totient is φ = 51636838.

The previous prime is 51636811. The next prime is 51636847. The reversal of 51636839 is 93863615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51636839 - 2⁸ = 51636583 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51636796 and 51636805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51636869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25818419 + 25818420.

It is an arithmetic number, because the mean of its divisors is an integer number (25818420).

Almost surely, 2^51636839 is an apocalyptic number.

51636839 is a deficient number, since it is larger than the sum of its proper divisors (1).

51636839 is an equidigital number, since it uses as much as digits as its factorization.

51636839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 51636839 is about 7185.8777473597. The cubic root of 51636839 is about 372.3801731601.

The spelling of 51636839 in words is "fifty-one million, six hundred thirty-six thousand, eight hundred thirty-nine".