6220781 has 4 divisors (see below), whose sum is σ = 7109472. Its totient is φ = 5332092.

The previous prime is 6220777. The next prime is 6220813. The reversal of 6220781 is 1870226.

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: 1870226 = 2 ⋅935113.

It is a cyclic number.

It is not a de Polignac number, because 6220781 - 2² = 6220777 is a prime.

It is a super-2 number, since 2×6220781² = 77396232499922, 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 6220781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6220751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444335 + ... + 444348.

It is an arithmetic number, because the mean of its divisors is an integer number (1777368).

Almost surely, 2^6220781 is an apocalyptic number.

It is an amenable number.

6220781 is a deficient number, since it is larger than the sum of its proper divisors (888691).

6220781 is an equidigital number, since it uses as much as digits as its factorization.

6220781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888690.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 6220781 is about 2494.1493539882. The cubic root of 6220781 is about 183.9140765330.

The spelling of 6220781 in words is "six million, two hundred twenty thousand, seven hundred eighty-one".