51325909 has 2 divisors, whose sum is σ = 51325910. Its totient is φ = 51325908.

The previous prime is 51325849. The next prime is 51325913. The reversal of 51325909 is 90952315.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43362225 + 7963684 = 6585^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 51325909 - 2¹¹ = 51323861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51325979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25662954 + 25662955.

It is an arithmetic number, because the mean of its divisors is an integer number (25662955).

Almost surely, 2^51325909 is an apocalyptic number.

It is an amenable number.

51325909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51325909 is an equidigital number, since it uses as much as digits as its factorization.

51325909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 51325909 is about 7164.2102844626. The cubic root of 51325909 is about 371.6312417947.

The spelling of 51325909 in words is "fifty-one million, three hundred twenty-five thousand, nine hundred nine".