428904191 has 2 divisors, whose sum is σ = 428904192. Its totient is φ = 428904190.

The previous prime is 428904181. The next prime is 428904197. The reversal of 428904191 is 191409824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428904191 - 2¹⁸ = 428642047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428904197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214452095 + 214452096.

It is an arithmetic number, because the mean of its divisors is an integer number (214452096).

Almost surely, 2^428904191 is an apocalyptic number.

428904191 is a deficient number, since it is larger than the sum of its proper divisors (1).

428904191 is an equidigital number, since it uses as much as digits as its factorization.

428904191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 428904191 is about 20710.0021970062. The cubic root of 428904191 is about 754.1425237220.

The spelling of 428904191 in words is "four hundred twenty-eight million, nine hundred four thousand, one hundred ninety-one".