9139681 has 4 divisors (see below), whose sum is σ = 9206532. Its totient is φ = 9072832.

The previous prime is 9139661. The next prime is 9139687. The reversal of 9139681 is 1869319.

9139681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 2509056 = 2575^2 + 1584^2 .

It is a cyclic number.

It is not a de Polignac number, because 9139681 - 2⁵ = 9139649 is a prime.

It is a super-2 number, since 2×9139681² = 167067537563522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9139681.

It is not an unprimeable number, because it can be changed into a prime (9139687) 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 3 ways as a sum of consecutive naturals, for example, 33220 + ... + 33493.

It is an arithmetic number, because the mean of its divisors is an integer number (2301633).

Almost surely, 2^9139681 is an apocalyptic number.

It is an amenable number.

9139681 is a deficient number, since it is larger than the sum of its proper divisors (66851).

9139681 is a wasteful number, since it uses less digits than its factorization.

9139681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66850.

The product of its digits is 11664, while the sum is 37.

The square root of 9139681 is about 3023.1905331950. The cubic root of 9139681 is about 209.0789671303.

The spelling of 9139681 in words is "nine million, one hundred thirty-nine thousand, six hundred eighty-one".