428219791 has 2 divisors, whose sum is σ = 428219792. Its totient is φ = 428219790.

The previous prime is 428219677. The next prime is 428219797. The reversal of 428219791 is 197912824.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428219791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428219797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214109895 + 214109896.

It is an arithmetic number, because the mean of its divisors is an integer number (214109896).

Almost surely, 2^428219791 is an apocalyptic number.

428219791 is a deficient number, since it is larger than the sum of its proper divisors (1).

428219791 is an equidigital number, since it uses as much as digits as its factorization.

428219791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 428219791 is about 20693.4721832756. The cubic root of 428219791 is about 753.7411831826.

The spelling of 428219791 in words is "four hundred twenty-eight million, two hundred nineteen thousand, seven hundred ninety-one".