51686863 has 2 divisors, whose sum is σ = 51686864. Its totient is φ = 51686862.

The previous prime is 51686849. The next prime is 51686879. The reversal of 51686863 is 36868615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51686863 - 2⁹ = 51686351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51686893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25843431 + 25843432.

It is an arithmetic number, because the mean of its divisors is an integer number (25843432).

Almost surely, 2^51686863 is an apocalyptic number.

51686863 is a deficient number, since it is larger than the sum of its proper divisors (1).

51686863 is an equidigital number, since it uses as much as digits as its factorization.

51686863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 51686863 is about 7189.3576208170. The cubic root of 51686863 is about 372.5003840664.

The spelling of 51686863 in words is "fifty-one million, six hundred eighty-six thousand, eight hundred sixty-three".