6211391 has 4 divisors (see below), whose sum is σ = 6251112. Its totient is φ = 6171672.

The previous prime is 6211367. The next prime is 6211397. The reversal of 6211391 is 1931126.

It is a happy number.

6211391 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 6211391 - 2¹⁸ = 5949247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6211397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19625 + ... + 19938.

It is an arithmetic number, because the mean of its divisors is an integer number (1562778).

Almost surely, 2^6211391 is an apocalyptic number.

6211391 is a deficient number, since it is larger than the sum of its proper divisors (39721).

6211391 is a wasteful number, since it uses less digits than its factorization.

6211391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39720.

The product of its digits is 324, while the sum is 23.

The square root of 6211391 is about 2492.2662377844. The cubic root of 6211391 is about 183.8214931512.

The spelling of 6211391 in words is "six million, two hundred eleven thousand, three hundred ninety-one".