51571243 has 2 divisors, whose sum is σ = 51571244. Its totient is φ = 51571242.

The previous prime is 51571231. The next prime is 51571249. The reversal of 51571243 is 34217515.

It is a happy number.

51571243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51571243 - 2⁵ = 51571211 is a prime.

It is not a weakly prime, because it can be changed into another prime (51571249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25785621 + 25785622.

It is an arithmetic number, because the mean of its divisors is an integer number (25785622).

Almost surely, 2^51571243 is an apocalyptic number.

51571243 is a deficient number, since it is larger than the sum of its proper divisors (1).

51571243 is an equidigital number, since it uses as much as digits as its factorization.

51571243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 51571243 is about 7181.3120667466. The cubic root of 51571243 is about 372.2224240224. Note that the first 3 decimals are identical.

Adding to 51571243 its reverse (34217515), we get a palindrome (85788758).

It can be divided in two parts, 5157 and 1243, that added together give a square (6400 = 80²).

The spelling of 51571243 in words is "fifty-one million, five hundred seventy-one thousand, two hundred forty-three".