51342217 has 2 divisors, whose sum is σ = 51342218. Its totient is φ = 51342216.

The previous prime is 51342191. The next prime is 51342253. The reversal of 51342217 is 71224315.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51322896 + 19321 = 7164^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 51342217 - 2⁷ = 51342089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51342191 and 51342200.

It is not a weakly prime, because it can be changed into another prime (51342517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25671108 + 25671109.

It is an arithmetic number, because the mean of its divisors is an integer number (25671109).

Almost surely, 2^51342217 is an apocalyptic number.

It is an amenable number.

51342217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51342217 is an equidigital number, since it uses as much as digits as its factorization.

51342217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 25.

The square root of 51342217 is about 7165.3483516156. The cubic root of 51342217 is about 371.6705976200.

The spelling of 51342217 in words is "fifty-one million, three hundred forty-two thousand, two hundred seventeen".