1021535873 has 4 divisors (see below), whose sum is σ = 1021739268. Its totient is φ = 1021332480.

The previous prime is 1021535857. The next prime is 1021535891. The reversal of 1021535873 is 3785351201.

1021535873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 239382784 + 782153089 = 15472^2 + 27967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021535873 - 2⁴ = 1021535857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021535813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93968 + ... + 104273.

It is an arithmetic number, because the mean of its divisors is an integer number (255434817).

Almost surely, 2^1021535873 is an apocalyptic number.

It is an amenable number.

1021535873 is a deficient number, since it is larger than the sum of its proper divisors (203395).

1021535873 is an equidigital number, since it uses as much as digits as its factorization.

1021535873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203394.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1021535873 is about 31961.4748251704. The cubic root of 1021535873 is about 1007.1276995273.

The spelling of 1021535873 in words is "one billion, twenty-one million, five hundred thirty-five thousand, eight hundred seventy-three".