51722917 has 2 divisors, whose sum is σ = 51722918. Its totient is φ = 51722916.

The previous prime is 51722897. The next prime is 51722939. The reversal of 51722917 is 71922715.

51722917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30184036 + 21538881 = 5494^2 + 4641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51722917 is a prime.

It is equal to p_3098158 and since 51722917 and 3098158 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51722977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25861458 + 25861459.

It is an arithmetic number, because the mean of its divisors is an integer number (25861459).

Almost surely, 2^51722917 is an apocalyptic number.

It is an amenable number.

51722917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51722917 is an equidigital number, since it uses as much as digits as its factorization.

51722917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 34.

The square root of 51722917 is about 7191.8646399943. The cubic root of 51722917 is about 372.5869760717.

The spelling of 51722917 in words is "fifty-one million, seven hundred twenty-two thousand, nine hundred seventeen".