4278691 has 2 divisors, whose sum is σ = 4278692. Its totient is φ = 4278690.

The previous prime is 4278671. The next prime is 4278697. The reversal of 4278691 is 1968724.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4278691 - 2⁷ = 4278563 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4278691.

It is not a weakly prime, because it can be changed into another prime (4278697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2139345 + 2139346.

It is an arithmetic number, because the mean of its divisors is an integer number (2139346).

Almost surely, 2^4278691 is an apocalyptic number.

4278691 is a deficient number, since it is larger than the sum of its proper divisors (1).

4278691 is an equidigital number, since it uses as much as digits as its factorization.

4278691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 4278691 is about 2068.4996978487. The cubic root of 4278691 is about 162.3442736924.

The spelling of 4278691 in words is "four million, two hundred seventy-eight thousand, six hundred ninety-one".