10640081 has 4 divisors (see below), whose sum is σ = 10648500. Its totient is φ = 10631664.

The previous prime is 10640051. The next prime is 10640087. The reversal of 10640081 is 18004601.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1392400 + 9247681 = 1180^2 + 3041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10640081 is a prime.

It is a super-2 number, since 2×10640081² = 226422647373122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10640087) 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 3 ways as a sum of consecutive naturals, for example, 1886 + ... + 4983.

It is an arithmetic number, because the mean of its divisors is an integer number (2662125).

Almost surely, 2^10640081 is an apocalyptic number.

It is an amenable number.

10640081 is a deficient number, since it is larger than the sum of its proper divisors (8419).

10640081 is an equidigital number, since it uses as much as digits as its factorization.

10640081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 10640081 is about 3261.9137021080. The cubic root of 10640081 is about 219.9454479067.

Adding to 10640081 its reverse (18004601), we get a palindrome (28644682).

The spelling of 10640081 in words is "ten million, six hundred forty thousand, eighty-one".