6181985 has 4 divisors (see below), whose sum is σ = 7418388. Its totient is φ = 4945584.

The previous prime is 6181969. The next prime is 6181993. The reversal of 6181985 is 5891816.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3356224 + 2825761 = 1832^2 + 1681^2 .

It is a cyclic number.

It is not a de Polignac number, because 6181985 - 2⁴ = 6181969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618194 + ... + 618203.

It is an arithmetic number, because the mean of its divisors is an integer number (1854597).

Almost surely, 2^6181985 is an apocalyptic number.

It is an amenable number.

6181985 is a deficient number, since it is larger than the sum of its proper divisors (1236403).

6181985 is a wasteful number, since it uses less digits than its factorization.

6181985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236402.

The product of its digits is 17280, while the sum is 38.

The square root of 6181985 is about 2486.3597889284. The cubic root of 6181985 is about 183.5309512789.

The spelling of 6181985 in words is "six million, one hundred eighty-one thousand, nine hundred eighty-five".