71681361 has 16 divisors (see below), whose sum is σ = 97474560. Its totient is φ = 46846800.

The previous prime is 71681341. The next prime is 71681377. The reversal of 71681361 is 16318617.

It is not a de Polignac number, because 71681361 - 2⁵ = 71681329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71681341) 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 15 ways as a sum of consecutive naturals, for example, 34786 + ... + 36788.

It is an arithmetic number, because the mean of its divisors is an integer number (6092160).

Almost surely, 2^71681361 is an apocalyptic number.

It is an amenable number.

71681361 is a deficient number, since it is larger than the sum of its proper divisors (25793199).

71681361 is a wasteful number, since it uses less digits than its factorization.

71681361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236.

The product of its digits is 6048, while the sum is 33.

The square root of 71681361 is about 8466.4845715326. The cubic root of 71681361 is about 415.4021572179.

Adding to 71681361 its reverse (16318617), we get a palindrome (87999978).

The spelling of 71681361 in words is "seventy-one million, six hundred eighty-one thousand, three hundred sixty-one".