1128630161 has 4 divisors (see below), whose sum is σ = 1128870912. Its totient is φ = 1128389412.

The previous prime is 1128630157. The next prime is 1128630193. The reversal of 1128630161 is 1610368211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1128630161 - 2² = 1128630157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128630121) 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 in 3 ways as a sum of consecutive naturals, for example, 113201 + ... + 122766.

It is an arithmetic number, because the mean of its divisors is an integer number (282217728).

Almost surely, 2^1128630161 is an apocalyptic number.

It is an amenable number.

1128630161 is a deficient number, since it is larger than the sum of its proper divisors (240751).

1128630161 is an equidigital number, since it uses as much as digits as its factorization.

1128630161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240750.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1128630161 is about 33595.0913229894. The cubic root of 1128630161 is about 1041.1593829004.

Adding to 1128630161 its reverse (1610368211), we get a palindrome (2738998372).

The spelling of 1128630161 in words is "one billion, one hundred twenty-eight million, six hundred thirty thousand, one hundred sixty-one".