6181 has 4 divisors (see below), whose sum is σ = 7072. Its totient is φ = 5292.

The previous prime is 6173. The next prime is 6197. The reversal of 6181 is 1816.

6181 = T₁₃ + T₁₄ + ... + T₃₃.

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 not a de Polignac number, because 6181 - 2³ = 6173 is a prime.

It is a super-2 number, since 2×6181² = 76409522, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435 + ... + 448.

It is an arithmetic number, because the mean of its divisors is an integer number (1768).

2⁶¹⁸¹ is an apocalyptic number.

It is an amenable number.

6181 is a deficient number, since it is larger than the sum of its proper divisors (891).

6181 is an equidigital number, since it uses as much as digits as its factorization.

6181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its digits is 48, while the sum is 16.

The square root of 6181 is about 78.6193360440. The cubic root of 6181 is about 18.3521203192.

Adding to 6181 its reverse (1816), we get a palindrome (7997).

The spelling of 6181 in words is "six thousand, one hundred eighty-one".