4278191 has 4 divisors (see below), whose sum is σ = 4282800. Its totient is φ = 4273584.

The previous prime is 4278179. The next prime is 4278193. The reversal of 4278191 is 1918724.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4278191 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 (4278193) 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, 371 + ... + 2948.

It is an arithmetic number, because the mean of its divisors is an integer number (1070700).

Almost surely, 2^4278191 is an apocalyptic number.

4278191 is a deficient number, since it is larger than the sum of its proper divisors (4609).

4278191 is a wasteful number, since it uses less digits than its factorization.

4278191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608.

The product of its digits is 4032, while the sum is 32.

The square root of 4278191 is about 2068.3788337730. The cubic root of 4278191 is about 162.3379496945.

The spelling of 4278191 in words is "four million, two hundred seventy-eight thousand, one hundred ninety-one".