71381873 has 2 divisors, whose sum is σ = 71381874. Its totient is φ = 71381872.

The previous prime is 71381837. The next prime is 71381881. The reversal of 71381873 is 37818317.

Together with previous prime (71381837) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51739249 + 19642624 = 7193^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 71381873 - 2⁸ = 71381617 is a prime.

It is not a weakly prime, because it can be changed into another prime (71381833) 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, 35690936 + 35690937.

It is an arithmetic number, because the mean of its divisors is an integer number (35690937).

Almost surely, 2^71381873 is an apocalyptic number.

It is an amenable number.

71381873 is a deficient number, since it is larger than the sum of its proper divisors (1).

71381873 is an equidigital number, since it uses as much as digits as its factorization.

71381873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 38.

The square root of 71381873 is about 8448.7793792950. The cubic root of 71381873 is about 414.8228265825.

The spelling of 71381873 in words is "seventy-one million, three hundred eighty-one thousand, eight hundred seventy-three".