51386939 has 2 divisors, whose sum is σ = 51386940. Its totient is φ = 51386938.

The previous prime is 51386917. The next prime is 51386941. The reversal of 51386939 is 93968315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51386939 - 2¹² = 51382843 is a prime.

Together with 51386941, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51386939.

It is not a weakly prime, because it can be changed into another prime (51386999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25693469 + 25693470.

It is an arithmetic number, because the mean of its divisors is an integer number (25693470).

Almost surely, 2^51386939 is an apocalyptic number.

51386939 is a deficient number, since it is larger than the sum of its proper divisors (1).

51386939 is an equidigital number, since it uses as much as digits as its factorization.

51386939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 51386939 is about 7168.4683859246. The cubic root of 51386939 is about 371.7784817329.

It can be divided in two parts, 51386 and 939, that added together give a palindrome (52325).

The spelling of 51386939 in words is "fifty-one million, three hundred eighty-six thousand, nine hundred thirty-nine".