51005771 has 2 divisors, whose sum is σ = 51005772. Its totient is φ = 51005770.

The previous prime is 51005753. The next prime is 51005777. The reversal of 51005771 is 17750015.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51005771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51005771.

It is not a weakly prime, because it can be changed into another prime (51005777) 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, 25502885 + 25502886.

It is an arithmetic number, because the mean of its divisors is an integer number (25502886).

Almost surely, 2^51005771 is an apocalyptic number.

51005771 is a deficient number, since it is larger than the sum of its proper divisors (1).

51005771 is an equidigital number, since it uses as much as digits as its factorization.

51005771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1225, while the sum is 26.

The square root of 51005771 is about 7141.8324679315. The cubic root of 51005771 is about 370.8569642083.

Adding to 51005771 its reverse (17750015), we get a palindrome (68755786).

The spelling of 51005771 in words is "fifty-one million, five thousand, seven hundred seventy-one".