51340909 has 2 divisors, whose sum is σ = 51340910. Its totient is φ = 51340908.

The previous prime is 51340879. The next prime is 51340921. The reversal of 51340909 is 90904315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 18679684 = 5715^2 + 4322^2 .

It is a cyclic number.

It is not a de Polignac number, because 51340909 - 2¹⁵ = 51308141 is a prime.

It is a Chen prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25670454 + 25670455.

It is an arithmetic number, because the mean of its divisors is an integer number (25670455).

Almost surely, 2^51340909 is an apocalyptic number.

It is an amenable number.

51340909 is a deficient number, since it is larger than the sum of its proper divisors (1).

51340909 is an equidigital number, since it uses as much as digits as its factorization.

51340909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 51340909 is about 7165.2570784306. The cubic root of 51340909 is about 371.6674413527.

The spelling of 51340909 in words is "fifty-one million, three hundred forty thousand, nine hundred nine".