51223009 has 2 divisors, whose sum is σ = 51223010. Its totient is φ = 51223008.

The previous prime is 51222991. The next prime is 51223027. The reversal of 51223009 is 90032215.

51223009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (51222991) and next prime (51223027).

It can be written as a sum of positive squares in only one way, i.e., 51165409 + 57600 = 7153^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 51223009 - 2¹³ = 51214817 is a prime.

It is not a weakly prime, because it can be changed into another prime (51223049) 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, 25611504 + 25611505.

It is an arithmetic number, because the mean of its divisors is an integer number (25611505).

Almost surely, 2^51223009 is an apocalyptic number.

It is an amenable number.

51223009 is a deficient number, since it is larger than the sum of its proper divisors (1).

51223009 is an equidigital number, since it uses as much as digits as its factorization.

51223009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 51223009 is about 7157.0251501584. The cubic root of 51223009 is about 371.3827224824.

The spelling of 51223009 in words is "fifty-one million, two hundred twenty-three thousand, nine".