6229781 has 4 divisors (see below), whose sum is σ = 6291564. Its totient is φ = 6168000.

The previous prime is 6229723. The next prime is 6229789. The reversal of 6229781 is 1879226.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1879226 = 2 ⋅939613.

It can be written as a sum of positive squares in 2 ways, for example, as 5522500 + 707281 = 2350^2 + 841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6229781 is a prime.

It is a super-2 number, since 2×6229781² = 77620342615922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6229789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30740 + ... + 30941.

It is an arithmetic number, because the mean of its divisors is an integer number (1572891).

Almost surely, 2^6229781 is an apocalyptic number.

It is an amenable number.

6229781 is a deficient number, since it is larger than the sum of its proper divisors (61783).

6229781 is a wasteful number, since it uses less digits than its factorization.

6229781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61782.

The product of its digits is 12096, while the sum is 35.

The square root of 6229781 is about 2495.9529242356. The cubic root of 6229781 is about 184.0027271965.

The spelling of 6229781 in words is "six million, two hundred twenty-nine thousand, seven hundred eighty-one".