8131678511 has 4 divisors (see below), whose sum is σ = 8870922024. Its totient is φ = 7392435000.

The previous prime is 8131678483. The next prime is 8131678523. The reversal of 8131678511 is 1158761318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8131678511 - 2¹⁸ = 8131416367 is a prime.

It is a super-2 number, since 2×8131678511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131678531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369621740 + ... + 369621761.

It is an arithmetic number, because the mean of its divisors is an integer number (2217730506).

Almost surely, 2^8131678511 is an apocalyptic number.

8131678511 is a deficient number, since it is larger than the sum of its proper divisors (739243513).

8131678511 is a wasteful number, since it uses less digits than its factorization.

8131678511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739243512.

The product of its digits is 40320, while the sum is 41.

The square root of 8131678511 is about 90175.8199907270. The cubic root of 8131678511 is about 2010.9135481613.

The spelling of 8131678511 in words is "eight billion, one hundred thirty-one million, six hundred seventy-eight thousand, five hundred eleven".