51384917 has 2 divisors, whose sum is σ = 51384918. Its totient is φ = 51384916.

The previous prime is 51384869. The next prime is 51384923. The reversal of 51384917 is 71948315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 13942756 = 6119^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 51384917 - 2⁸ = 51384661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51384937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25692458 + 25692459.

It is an arithmetic number, because the mean of its divisors is an integer number (25692459).

Almost surely, 2^51384917 is an apocalyptic number.

It is an amenable number.

51384917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51384917 is an equidigital number, since it uses as much as digits as its factorization.

51384917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 51384917 is about 7168.3273502261. The cubic root of 51384917 is about 371.7736053579.

The spelling of 51384917 in words is "fifty-one million, three hundred eighty-four thousand, nine hundred seventeen".