51040217 has 2 divisors, whose sum is σ = 51040218. Its totient is φ = 51040216.

The previous prime is 51040211. The next prime is 51040259. The reversal of 51040217 is 71204015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51036736 + 3481 = 7144^2 + 59^2 .

It is a cyclic number.

It is not a de Polignac number, because 51040217 - 2⁶ = 51040153 is a prime.

It is not a weakly prime, because it can be changed into another prime (51040211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25520108 + 25520109.

It is an arithmetic number, because the mean of its divisors is an integer number (25520109).

Almost surely, 2^51040217 is an apocalyptic number.

It is an amenable number.

51040217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51040217 is an equidigital number, since it uses as much as digits as its factorization.

51040217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 51040217 is about 7144.2436268649. The cubic root of 51040217 is about 370.9404296941.

The spelling of 51040217 in words is "fifty-one million, forty thousand, two hundred seventeen".