51006217 has 2 divisors, whose sum is σ = 51006218. Its totient is φ = 51006216.

The previous prime is 51006211. The next prime is 51006289. The reversal of 51006217 is 71260015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39200121 + 11806096 = 6261^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 51006217 - 2¹¹ = 51004169 is a prime.

It is not a weakly prime, because it can be changed into another prime (51006211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25503108 + 25503109.

It is an arithmetic number, because the mean of its divisors is an integer number (25503109).

Almost surely, 2^51006217 is an apocalyptic number.

It is an amenable number.

51006217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51006217 is an equidigital number, since it uses as much as digits as its factorization.

51006217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 51006217 is about 7141.8636923425. The cubic root of 51006217 is about 370.8580451430.

The spelling of 51006217 in words is "fifty-one million, six thousand, two hundred seventeen".