6181861 has 8 divisors (see below), whose sum is σ = 7113600. Its totient is φ = 5262288.

The previous prime is 6181841. The next prime is 6181873. The reversal of 6181861 is 1681816.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6181861 - 2⁹ = 6181349 is a prime.

It is a Duffinian number.

6181861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6181811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1921 + ... + 4006.

It is an arithmetic number, because the mean of its divisors is an integer number (889200).

Almost surely, 2^6181861 is an apocalyptic number.

It is an amenable number.

6181861 is a deficient number, since it is larger than the sum of its proper divisors (931739).

6181861 is a wasteful number, since it uses less digits than its factorization.

6181861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6083.

The product of its digits is 2304, while the sum is 31.

The square root of 6181861 is about 2486.3348527501. The cubic root of 6181861 is about 183.5297241655.

The spelling of 6181861 in words is "six million, one hundred eighty-one thousand, eight hundred sixty-one".