4543991 has 2 divisors, whose sum is σ = 4543992. Its totient is φ = 4543990.

The previous prime is 4543963. The next prime is 4543993. The reversal of 4543991 is 1993454.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4543991 - 2⁶ = 4543927 is a prime.

Together with 4543993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4543993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2271995 + 2271996.

It is an arithmetic number, because the mean of its divisors is an integer number (2271996).

Almost surely, 2^4543991 is an apocalyptic number.

4543991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4543991 is an equidigital number, since it uses as much as digits as its factorization.

4543991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 4543991 is about 2131.6639040899. The cubic root of 4543991 is about 165.6326006243.

The spelling of 4543991 in words is "four million, five hundred forty-three thousand, nine hundred ninety-one".