10818781 has 4 divisors (see below), whose sum is σ = 10857564. Its totient is φ = 10780000.

The previous prime is 10818779. The next prime is 10818833. The reversal of 10818781 is 18781801.

10818781 is digitally balanced in base 2, 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 7812025 + 3006756 = 2795^2 + 1734^2 .

It is a cyclic number.

It is not a de Polignac number, because 10818781 - 2¹ = 10818779 is a prime.

It is a super-2 number, since 2×10818781² = 234092044651922, which 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 (10818481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18970 + ... + 19531.

It is an arithmetic number, because the mean of its divisors is an integer number (2714391).

Almost surely, 2^10818781 is an apocalyptic number.

It is an amenable number.

10818781 is a deficient number, since it is larger than the sum of its proper divisors (38783).

10818781 is an equidigital number, since it uses as much as digits as its factorization.

10818781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38782.

The product of its (nonzero) digits is 3584, while the sum is 34.

The square root of 10818781 is about 3289.1915420054. The cubic root of 10818781 is about 221.1699449697.

The spelling of 10818781 in words is "ten million, eight hundred eighteen thousand, seven hundred eighty-one".