71130681 has 12 divisors (see below), whose sum is σ = 102919908. Its totient is φ = 47339424.

The previous prime is 71130673. The next prime is 71130691. The reversal of 71130681 is 18603117.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 56385081 = 3840^2 + 7509^2 .

It is not a de Polignac number, because 71130681 - 2³ = 71130673 is a prime.

It is a super-2 number, since 2×71130681² = 10119147559047522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71130671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 930 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (8576659).

Almost surely, 2^71130681 is an apocalyptic number.

It is an amenable number.

71130681 is a deficient number, since it is larger than the sum of its proper divisors (31789227).

71130681 is a wasteful number, since it uses less digits than its factorization.

71130681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13512 (or 13509 counting only the distinct ones).

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

The square root of 71130681 is about 8433.9006989649. The cubic root of 71130681 is about 414.3356690965.

Adding to 71130681 its reverse (18603117), we get a palindrome (89733798).

The spelling of 71130681 in words is "seventy-one million, one hundred thirty thousand, six hundred eighty-one".