6801781 has 4 divisors (see below), whose sum is σ = 7773472. Its totient is φ = 5830092.

The previous prime is 6801779. The next prime is 6801787. The reversal of 6801781 is 1871086.

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.

It is a cyclic number.

It is not a de Polignac number, because 6801781 - 2¹ = 6801779 is a prime.

It is a super-2 number, since 2×6801781² = 92528449543922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6801787) 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, 485835 + ... + 485848.

It is an arithmetic number, because the mean of its divisors is an integer number (1943368).

Almost surely, 2^6801781 is an apocalyptic number.

It is an amenable number.

6801781 is a deficient number, since it is larger than the sum of its proper divisors (971691).

6801781 is an equidigital number, since it uses as much as digits as its factorization.

6801781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971690.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 6801781 is about 2608.0224308851. The cubic root of 6801781 is about 189.4701860398.

The spelling of 6801781 in words is "six million, eight hundred one thousand, seven hundred eighty-one".