51548813 has 2 divisors, whose sum is σ = 51548814. Its totient is φ = 51548812.

The previous prime is 51548797. The next prime is 51548821. The reversal of 51548813 is 31884515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50879689 + 669124 = 7133^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 51548813 - 2⁴ = 51548797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_3088385 and since 51548813 and 3088385 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51548113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25774406 + 25774407.

It is an arithmetic number, because the mean of its divisors is an integer number (25774407).

Almost surely, 2^51548813 is an apocalyptic number.

It is an amenable number.

51548813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51548813 is an equidigital number, since it uses as much as digits as its factorization.

51548813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19200, while the sum is 35.

The square root of 51548813 is about 7179.7502045684. The cubic root of 51548813 is about 372.1684523437.

The spelling of 51548813 in words is "fifty-one million, five hundred forty-eight thousand, eight hundred thirteen".