4638191 has 2 divisors, whose sum is σ = 4638192. Its totient is φ = 4638190.

The previous prime is 4638187. The next prime is 4638197. The reversal of 4638191 is 1918364.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4638191 - 2² = 4638187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4638197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2319095 + 2319096.

It is an arithmetic number, because the mean of its divisors is an integer number (2319096).

Almost surely, 2^4638191 is an apocalyptic number.

4638191 is a deficient number, since it is larger than the sum of its proper divisors (1).

4638191 is an equidigital number, since it uses as much as digits as its factorization.

4638191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 4638191 is about 2153.6459783353. The cubic root of 4638191 is about 166.7693398474.

The spelling of 4638191 in words is "four million, six hundred thirty-eight thousand, one hundred ninety-one".