1028855513 has 4 divisors (see below), whose sum is σ = 1175834880. Its totient is φ = 881876148.

The previous prime is 1028855501. The next prime is 1028855543. The reversal of 1028855513 is 3155588201.

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 1028855513 - 2⁸ = 1028855257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1028855543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73489673 + ... + 73489686.

It is an arithmetic number, because the mean of its divisors is an integer number (293958720).

Almost surely, 2^1028855513 is an apocalyptic number.

It is an amenable number.

1028855513 is a deficient number, since it is larger than the sum of its proper divisors (146979367).

1028855513 is an equidigital number, since it uses as much as digits as its factorization.

1028855513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146979366.

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 1028855513 is about 32075.7776678914. Note that the first 3 decimals coincide. The cubic root of 1028855513 is about 1009.5274438710.

The spelling of 1028855513 in words is "one billion, twenty-eight million, eight hundred fifty-five thousand, five hundred thirteen".