10819681 has 4 divisors (see below), whose sum is σ = 10834452. Its totient is φ = 10804912.

The previous prime is 10819673. The next prime is 10819687. The reversal of 10819681 is 18691801.

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 2611456 + 8208225 = 1616^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 10819681 - 2³ = 10819673 is a prime.

It is a super-2 number, since 2×10819681² = 234130993883522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10819687) 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, 6226 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (2708613).

Almost surely, 2^10819681 is an apocalyptic number.

It is an amenable number.

10819681 is a deficient number, since it is larger than the sum of its proper divisors (14771).

10819681 is an equidigital number, since it uses as much as digits as its factorization.

10819681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14770.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 10819681 is about 3289.3283508948. The cubic root of 10819681 is about 221.1760777441.

The spelling of 10819681 in words is "ten million, eight hundred nineteen thousand, six hundred eighty-one".