1428857161 has 2 divisors, whose sum is σ = 1428857162. Its totient is φ = 1428857160.

The previous prime is 1428857149. The next prime is 1428857189. The reversal of 1428857161 is 1617588241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1428840000 + 17161 = 37800^2 + 131^2 .

It is an emirp because it is prime and its reverse (1617588241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428857161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1428857141) 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, 714428580 + 714428581.

It is an arithmetic number, because the mean of its divisors is an integer number (714428581).

Almost surely, 2^1428857161 is an apocalyptic number.

It is an amenable number.

1428857161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428857161 is an equidigital number, since it uses as much as digits as its factorization.

1428857161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 43.

The square root of 1428857161 is about 37800.2269966729. The cubic root of 1428857161 is about 1126.3229633978.

The spelling of 1428857161 in words is "one billion, four hundred twenty-eight million, eight hundred fifty-seven thousand, one hundred sixty-one".