51422209 has 2 divisors, whose sum is σ = 51422210. Its totient is φ = 51422208.

The previous prime is 51422201. The next prime is 51422233. The reversal of 51422209 is 90222415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 1507984 = 7065^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 51422209 - 2³ = 51422201 is a prime.

It is not a weakly prime, because it can be changed into another prime (51422201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25711104 + 25711105.

It is an arithmetic number, because the mean of its divisors is an integer number (25711105).

Almost surely, 2^51422209 is an apocalyptic number.

It is an amenable number.

51422209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51422209 is an equidigital number, since it uses as much as digits as its factorization.

51422209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51422209 is about 7170.9280431476. The cubic root of 51422209 is about 371.8635203857.

The spelling of 51422209 in words is "fifty-one million, four hundred twenty-two thousand, two hundred nine".