6820081 has 4 divisors (see below), whose sum is σ = 6838272. Its totient is φ = 6801892.

The previous prime is 6820067. The next prime is 6820087. The reversal of 6820081 is 1800286.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1800286 = 2 ⋅900143.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6820081 is a prime.

It is a super-2 number, since 2×6820081² = 93027009693122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6820087) 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, 8521 + ... + 9286.

It is an arithmetic number, because the mean of its divisors is an integer number (1709568).

Almost surely, 2^6820081 is an apocalyptic number.

It is an amenable number.

6820081 is a deficient number, since it is larger than the sum of its proper divisors (18191).

6820081 is a wasteful number, since it uses less digits than its factorization.

6820081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18190.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 6820081 is about 2611.5284796456. The cubic root of 6820081 is about 189.6399552753.

The spelling of 6820081 in words is "six million, eight hundred twenty thousand, eighty-one".