51350861 has 2 divisors, whose sum is σ = 51350862. Its totient is φ = 51350860.

The previous prime is 51350843. The next prime is 51350891. The reversal of 51350861 is 16805315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 855625 = 7106^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 51350861 - 2⁶ = 51350797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51350801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25675430 + 25675431.

It is an arithmetic number, because the mean of its divisors is an integer number (25675431).

Almost surely, 2^51350861 is an apocalyptic number.

It is an amenable number.

51350861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51350861 is an equidigital number, since it uses as much as digits as its factorization.

51350861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 51350861 is about 7165.9515069529. The cubic root of 51350861 is about 371.6914546622.

The spelling of 51350861 in words is "fifty-one million, three hundred fifty thousand, eight hundred sixty-one".