6840191 has 4 divisors (see below), whose sum is σ = 6870552. Its totient is φ = 6809832.

The previous prime is 6840187. The next prime is 6840199. The reversal of 6840191 is 1910486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1910486 = 2 ⋅955243.

It is a cyclic number.

It is not a de Polignac number, because 6840191 - 2² = 6840187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840199) 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, 14840 + ... + 15293.

It is an arithmetic number, because the mean of its divisors is an integer number (1717638).

Almost surely, 2^6840191 is an apocalyptic number.

6840191 is a deficient number, since it is larger than the sum of its proper divisors (30361).

6840191 is a wasteful number, since it uses less digits than its factorization.

6840191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30360.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 6840191 is about 2615.3758812071. The cubic root of 6840191 is about 189.8261660282.

The spelling of 6840191 in words is "six million, eight hundred forty thousand, one hundred ninety-one".