71867932181 has 2 divisors, whose sum is σ = 71867932182. Its totient is φ = 71867932180.

The previous prime is 71867932141. The next prime is 71867932207. The reversal of 71867932181 is 18123976817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57760431556 + 14107500625 = 240334^2 + 118775^2 .

It is a cyclic number.

It is not a de Polignac number, because 71867932181 - 2¹⁸ = 71867670037 is a prime.

It is a super-2 number, since 2×71867932181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71867932111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35933966090 + 35933966091.

It is an arithmetic number, because the mean of its divisors is an integer number (35933966091).

Almost surely, 2^71867932181 is an apocalyptic number.

It is an amenable number.

71867932181 is a deficient number, since it is larger than the sum of its proper divisors (1).

71867932181 is an equidigital number, since it uses as much as digits as its factorization.

71867932181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The spelling of 71867932181 in words is "seventy-one billion, eight hundred sixty-seven million, nine hundred thirty-two thousand, one hundred eighty-one".