51222709 has 2 divisors, whose sum is σ = 51222710. Its totient is φ = 51222708.

The previous prime is 51222707. The next prime is 51222733. The reversal of 51222709 is 90722215.

51222709 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., 49660209 + 1562500 = 7047^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 51222709 - 2¹ = 51222707 is a prime.

Together with 51222707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51222707) 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, 25611354 + 25611355.

It is an arithmetic number, because the mean of its divisors is an integer number (25611355).

Almost surely, 2^51222709 is an apocalyptic number.

It is an amenable number.

51222709 is a deficient number, since it is larger than the sum of its proper divisors (1).

51222709 is an equidigital number, since it uses as much as digits as its factorization.

51222709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51222709 is about 7157.0041916992. The cubic root of 51222709 is about 371.3819974499.

The spelling of 51222709 in words is "fifty-one million, two hundred twenty-two thousand, seven hundred nine".