6209391 has 4 divisors (see below), whose sum is σ = 8279192. Its totient is φ = 4139592.

The previous prime is 6209383. The next prime is 6209407. The reversal of 6209391 is 1939026.

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

It is not a de Polignac number, because 6209391 - 2³ = 6209383 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6209341) 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, 1034896 + ... + 1034901.

It is an arithmetic number, because the mean of its divisors is an integer number (2069798).

Almost surely, 2^6209391 is an apocalyptic number.

6209391 is a deficient number, since it is larger than the sum of its proper divisors (2069801).

6209391 is a wasteful number, since it uses less digits than its factorization.

6209391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069800.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 6209391 is about 2491.8649642386. The cubic root of 6209391 is about 183.8017615295.

It can be divided in two parts, 620 and 9391, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 6209391 in words is "six million, two hundred nine thousand, three hundred ninety-one".