1028134561 has 4 divisors (see below), whose sum is σ = 1061300224. Its totient is φ = 994968900.

The previous prime is 1028134537. The next prime is 1028134579. The reversal of 1028134561 is 1654318201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1654318201 = 19 ⋅87069379.

It is a cyclic number.

It is not a de Polignac number, because 1028134561 - 2¹¹ = 1028132513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 33165631 = 1028134561 / (1 + 0 + 2 + 8 + 1 + 3 + 4 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028134501) 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, 16582785 + ... + 16582846.

It is an arithmetic number, because the mean of its divisors is an integer number (265325056).

Almost surely, 2^1028134561 is an apocalyptic number.

It is an amenable number.

1028134561 is a deficient number, since it is larger than the sum of its proper divisors (33165663).

1028134561 is an equidigital number, since it uses as much as digits as its factorization.

1028134561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33165662.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 1028134561 is about 32064.5374362394. The cubic root of 1028134561 is about 1009.2915860370.

The spelling of 1028134561 in words is "one billion, twenty-eight million, one hundred thirty-four thousand, five hundred sixty-one".