428432161 has 2 divisors, whose sum is σ = 428432162. Its totient is φ = 428432160.

The previous prime is 428432153. The next prime is 428432233. The reversal of 428432161 is 161234824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 425390625 + 3041536 = 20625^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 428432161 - 2³ = 428432153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428432111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214216080 + 214216081.

It is an arithmetic number, because the mean of its divisors is an integer number (214216081).

Almost surely, 2^428432161 is an apocalyptic number.

It is an amenable number.

428432161 is a deficient number, since it is larger than the sum of its proper divisors (1).

428432161 is an equidigital number, since it uses as much as digits as its factorization.

428432161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 428432161 is about 20698.6028755566. The cubic root of 428432161 is about 753.8657652810.

Adding to 428432161 its reverse (161234824), we get a palindrome (589666985).

The spelling of 428432161 in words is "four hundred twenty-eight million, four hundred thirty-two thousand, one hundred sixty-one".