51866417 has 2 divisors, whose sum is σ = 51866418. Its totient is φ = 51866416.

The previous prime is 51866407. The next prime is 51866443. The reversal of 51866417 is 71466815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50708641 + 1157776 = 7121^2 + 1076^2 .

It is a cyclic number.

It is not a de Polignac number, because 51866417 - 2⁴ = 51866401 is a prime.

It is not a weakly prime, because it can be changed into another prime (51866407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25933208 + 25933209.

It is an arithmetic number, because the mean of its divisors is an integer number (25933209).

Almost surely, 2^51866417 is an apocalyptic number.

It is an amenable number.

51866417 is a deficient number, since it is larger than the sum of its proper divisors (1).

51866417 is an equidigital number, since it uses as much as digits as its factorization.

51866417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 51866417 is about 7201.8342802372. The cubic root of 51866417 is about 372.9312261945.

The spelling of 51866417 in words is "fifty-one million, eight hundred sixty-six thousand, four hundred seventeen".