71681867 has 2 divisors, whose sum is σ = 71681868. Its totient is φ = 71681866.

The previous prime is 71681861. The next prime is 71681887. The reversal of 71681867 is 76818617.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71681867 - 2¹⁶ = 71616331 is a prime.

It is a super-3 number, since 3×71681867³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (71681861) 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, 35840933 + 35840934.

It is an arithmetic number, because the mean of its divisors is an integer number (35840934).

Almost surely, 2^71681867 is an apocalyptic number.

71681867 is a deficient number, since it is larger than the sum of its proper divisors (1).

71681867 is an equidigital number, since it uses as much as digits as its factorization.

71681867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 44.

The square root of 71681867 is about 8466.5144540123. The cubic root of 71681867 is about 415.4031346594.

The spelling of 71681867 in words is "seventy-one million, six hundred eighty-one thousand, eight hundred sixty-seven".