51382813 has 2 divisors, whose sum is σ = 51382814. Its totient is φ = 51382812.

The previous prime is 51382787. The next prime is 51382829. The reversal of 51382813 is 31828315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35366809 + 16016004 = 5947^2 + 4002^2 .

It is a cyclic number.

It is not a de Polignac number, because 51382813 - 2⁹ = 51382301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51382843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25691406 + 25691407.

It is an arithmetic number, because the mean of its divisors is an integer number (25691407).

Almost surely, 2^51382813 is an apocalyptic number.

It is an amenable number.

51382813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51382813 is an equidigital number, since it uses as much as digits as its factorization.

51382813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 51382813 is about 7168.1805920331. The cubic root of 51382813 is about 371.7685310911.

The spelling of 51382813 in words is "fifty-one million, three hundred eighty-two thousand, eight hundred thirteen".