4278991 has 2 divisors, whose sum is σ = 4278992. Its totient is φ = 4278990.

The previous prime is 4278959. The next prime is 4279007. The reversal of 4278991 is 1998724.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4278991 - 2⁵ = 4278959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4278931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139495 + 2139496.

It is an arithmetic number, because the mean of its divisors is an integer number (2139496).

Almost surely, 2^4278991 is an apocalyptic number.

4278991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278991 is an equidigital number, since it uses as much as digits as its factorization.

4278991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 40.

The square root of 4278991 is about 2068.5722129044. The cubic root of 4278991 is about 162.3480678547.

The spelling of 4278991 in words is "four million, two hundred seventy-eight thousand, nine hundred ninety-one".