71239853 has 2 divisors, whose sum is σ = 71239854. Its totient is φ = 71239852.

The previous prime is 71239789. The next prime is 71239859. The reversal of 71239853 is 35893217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69438889 + 1800964 = 8333^2 + 1342^2 .

It is an emirp because it is prime and its reverse (35893217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71239853 - 2⁶ = 71239789 is a prime.

It is equal to p_4186658 and since 71239853 and 4186658 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 (71239859) 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, 35619926 + 35619927.

It is an arithmetic number, because the mean of its divisors is an integer number (35619927).

Almost surely, 2^71239853 is an apocalyptic number.

It is an amenable number.

71239853 is a deficient number, since it is larger than the sum of its proper divisors (1).

71239853 is an equidigital number, since it uses as much as digits as its factorization.

71239853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 38.

The square root of 71239853 is about 8440.3704302596. The cubic root of 71239853 is about 414.5475360948.

The spelling of 71239853 in words is "seventy-one million, two hundred thirty-nine thousand, eight hundred fifty-three".