71013681 has 24 divisors (see below), whose sum is σ = 105670656. Its totient is φ = 45927360.

The previous prime is 71013671. The next prime is 71013707. The reversal of 71013681 is 18631017.

It is not a de Polignac number, because 71013681 - 2⁶ = 71013617 is a prime.

It is a super-2 number, since 2×71013681² = 10085885778339522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71013611) 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 in 23 ways as a sum of consecutive naturals, for example, 81856 + ... + 82718.

It is an arithmetic number, because the mean of its divisors is an integer number (4402944).

Almost surely, 2^71013681 is an apocalyptic number.

It is an amenable number.

71013681 is a deficient number, since it is larger than the sum of its proper divisors (34656975).

71013681 is a wasteful number, since it uses less digits than its factorization.

71013681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 71013681 is about 8426.9615520661. The cubic root of 71013681 is about 414.1083697260.

Adding to 71013681 its reverse (18631017), we get a palindrome (89644698).

The spelling of 71013681 in words is "seventy-one million, thirteen thousand, six hundred eighty-one".