1128561 has 16 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 633600.

The previous prime is 1128557. The next prime is 1128577. The reversal of 1128561 is 1658211.

1128561 = 29² + 30² + ... + 150².

It is not a de Polignac number, because 1128561 - 2² = 1128557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (109368).

2^1128561 is an apocalyptic number.

It is an amenable number.

1128561 is a deficient number, since it is larger than the sum of its proper divisors (621327).

1128561 is an equidigital number, since it uses as much as digits as its factorization.

1128561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952.

The product of its digits is 480, while the sum is 24.

The square root of 1128561 is about 1062.3375169879. The cubic root of 1128561 is about 104.1138115498.

The spelling of 1128561 in words is "one million, one hundred twenty-eight thousand, five hundred sixty-one".