6211987 has 4 divisors (see below), whose sum is σ = 6577416. Its totient is φ = 5846560.

The previous prime is 6211981. The next prime is 6212009. The reversal of 6211987 is 7891126.

It is a happy number.

6211987 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6211987 - 2¹¹ = 6209939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6211981) 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, 182689 + ... + 182722.

It is an arithmetic number, because the mean of its divisors is an integer number (1644354).

Almost surely, 2^6211987 is an apocalyptic number.

6211987 is a deficient number, since it is larger than the sum of its proper divisors (365429).

6211987 is a wasteful number, since it uses less digits than its factorization.

6211987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365428.

The product of its digits is 6048, while the sum is 34.

The square root of 6211987 is about 2492.3858048063. The cubic root of 6211987 is about 183.8273723552.

The spelling of 6211987 in words is "six million, two hundred eleven thousand, nine hundred eighty-seven".