51656851 has 2 divisors, whose sum is σ = 51656852. Its totient is φ = 51656850.

The previous prime is 51656833. The next prime is 51656861. The reversal of 51656851 is 15865615.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51656851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51656851.

It is not a weakly prime, because it can be changed into another prime (51656861) 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, 25828425 + 25828426.

It is an arithmetic number, because the mean of its divisors is an integer number (25828426).

Almost surely, 2^51656851 is an apocalyptic number.

51656851 is a deficient number, since it is larger than the sum of its proper divisors (1).

51656851 is an equidigital number, since it uses as much as digits as its factorization.

51656851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36000, while the sum is 37.

The square root of 51656851 is about 7187.2700658873. The cubic root of 51656851 is about 372.4282726028.

The spelling of 51656851 in words is "fifty-one million, six hundred fifty-six thousand, eight hundred fifty-one".