51900217 has 2 divisors, whose sum is σ = 51900218. Its totient is φ = 51900216.

The previous prime is 51900181. The next prime is 51900221. The reversal of 51900217 is 71200915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51897616 + 2601 = 7204^2 + 51^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51900217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51900191 and 51900200.

It is not a weakly prime, because it can be changed into another prime (51900257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25950108 + 25950109.

It is an arithmetic number, because the mean of its divisors is an integer number (25950109).

Almost surely, 2^51900217 is an apocalyptic number.

It is an amenable number.

51900217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51900217 is an equidigital number, since it uses as much as digits as its factorization.

51900217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 51900217 is about 7204.1805224467. The cubic root of 51900217 is about 373.0122184758.

The spelling of 51900217 in words is "fifty-one million, nine hundred thousand, two hundred seventeen".