428569831 has 2 divisors, whose sum is σ = 428569832. Its totient is φ = 428569830.

The previous prime is 428569733. The next prime is 428569849. The reversal of 428569831 is 138965824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428569831 - 2¹⁵ = 428537063 is a prime.

It is a super-2 number, since 2×428569831² = 367344200086737122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428569891) 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, 214284915 + 214284916.

It is an arithmetic number, because the mean of its divisors is an integer number (214284916).

Almost surely, 2^428569831 is an apocalyptic number.

428569831 is a deficient number, since it is larger than the sum of its proper divisors (1).

428569831 is an equidigital number, since it uses as much as digits as its factorization.

428569831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 428569831 is about 20701.9281952189. The cubic root of 428569831 is about 753.9465043064.

The spelling of 428569831 in words is "four hundred twenty-eight million, five hundred sixty-nine thousand, eight hundred thirty-one".