71885641 has 2 divisors, whose sum is σ = 71885642. Its totient is φ = 71885640.

The previous prime is 71885629. The next prime is 71885663. The reversal of 71885641 is 14658817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61779600 + 10106041 = 7860^2 + 3179^2 .

It is an emirp because it is prime and its reverse (14658817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71885641 - 2¹⁵ = 71852873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71885594 and 71885603.

It is not a weakly prime, because it can be changed into another prime (71885041) 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, 35942820 + 35942821.

It is an arithmetic number, because the mean of its divisors is an integer number (35942821).

Almost surely, 2^71885641 is an apocalyptic number.

It is an amenable number.

71885641 is a deficient number, since it is larger than the sum of its proper divisors (1).

71885641 is an equidigital number, since it uses as much as digits as its factorization.

71885641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 71885641 is about 8478.5400276227. The cubic root of 71885641 is about 415.7963920563.

The spelling of 71885641 in words is "seventy-one million, eight hundred eighty-five thousand, six hundred forty-one".