6109781 has 4 divisors (see below), whose sum is σ = 6187200. Its totient is φ = 6032364.

The previous prime is 6109769. The next prime is 6109799. The reversal of 6109781 is 1879016.

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 6109781 - 2⁶ = 6109717 is a prime.

It is a super-2 number, since 2×6109781² = 74658847735922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6109711) 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, 38591 + ... + 38748.

It is an arithmetic number, because the mean of its divisors is an integer number (1546800).

Almost surely, 2^6109781 is an apocalyptic number.

It is an amenable number.

6109781 is a deficient number, since it is larger than the sum of its proper divisors (77419).

6109781 is an equidigital number, since it uses as much as digits as its factorization.

6109781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77418.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 6109781 is about 2471.7971195064. The cubic root of 6109781 is about 182.8136197511.

The spelling of 6109781 in words is "six million, one hundred nine thousand, seven hundred eighty-one".