71888513 has 2 divisors, whose sum is σ = 71888514. Its totient is φ = 71888512.

The previous prime is 71888507. The next prime is 71888527. The reversal of 71888513 is 31588817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41770369 + 30118144 = 6463^2 + 5488^2 .

It is a cyclic number.

It is not a de Polignac number, because 71888513 - 2⁶ = 71888449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71888413) 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, 35944256 + 35944257.

It is an arithmetic number, because the mean of its divisors is an integer number (35944257).

Almost surely, 2^71888513 is an apocalyptic number.

It is an amenable number.

71888513 is a deficient number, since it is larger than the sum of its proper divisors (1).

71888513 is an equidigital number, since it uses as much as digits as its factorization.

71888513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 41.

The square root of 71888513 is about 8478.7093947133. The cubic root of 71888513 is about 415.8019293297.

The spelling of 71888513 in words is "seventy-one million, eight hundred eighty-eight thousand, five hundred thirteen".