71681193 has 20 divisors (see below), whose sum is σ = 107641600. Its totient is φ = 47536632.

The previous prime is 71681189. The next prime is 71681201. The reversal of 71681193 is 39118617.

It is not a de Polignac number, because 71681193 - 2² = 71681189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71681293) 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 in 19 ways as a sum of consecutive naturals, for example, 13896 + ... + 18342.

It is an arithmetic number, because the mean of its divisors is an integer number (5382080).

Almost surely, 2^71681193 is an apocalyptic number.

It is an amenable number.

71681193 is a deficient number, since it is larger than the sum of its proper divisors (35960407).

71681193 is a wasteful number, since it uses less digits than its factorization.

71681193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658 (or 4649 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 71681193 is about 8466.4746500536. The cubic root of 71681193 is about 415.4018326909.

The spelling of 71681193 in words is "seventy-one million, six hundred eighty-one thousand, one hundred ninety-three".