51855863 has 2 divisors, whose sum is σ = 51855864. Its totient is φ = 51855862.

The previous prime is 51855841. The next prime is 51855871. The reversal of 51855863 is 36855815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51855863 - 2⁸ = 51855607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51855863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51855803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25927931 + 25927932.

It is an arithmetic number, because the mean of its divisors is an integer number (25927932).

Almost surely, 2^51855863 is an apocalyptic number.

51855863 is a deficient number, since it is larger than the sum of its proper divisors (1).

51855863 is an equidigital number, since it uses as much as digits as its factorization.

51855863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 41.

The square root of 51855863 is about 7201.1015129631. The cubic root of 51855863 is about 372.9059292658.

The spelling of 51855863 in words is "fifty-one million, eight hundred fifty-five thousand, eight hundred sixty-three".