428538367991 has 2 divisors, whose sum is σ = 428538367992. Its totient is φ = 428538367990.

The previous prime is 428538367979. The next prime is 428538368021. The reversal of 428538367991 is 199763835824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428538367991 - 2⁶ = 428538367927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428538367391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214269183995 + 214269183996.

It is an arithmetic number, because the mean of its divisors is an integer number (214269183996).

Almost surely, 2^428538367991 is an apocalyptic number.

428538367991 is a deficient number, since it is larger than the sum of its proper divisors (1).

428538367991 is an equidigital number, since it uses as much as digits as its factorization.

428538367991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 65.

The spelling of 428538367991 in words is "four hundred twenty-eight billion, five hundred thirty-eight million, three hundred sixty-seven thousand, nine hundred ninety-one".