1028921273 has 4 divisors (see below), whose sum is σ = 1029100800. Its totient is φ = 1028741748.

The previous prime is 1028921263. The next prime is 1028921287. The reversal of 1028921273 is 3721298201.

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: 3721298201 = 1753 ⋅2122817.

It is a cyclic number.

It is not a de Polignac number, because 1028921273 - 2⁸ = 1028921017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1028921263) 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, 80873 + ... + 92726.

It is an arithmetic number, because the mean of its divisors is an integer number (257275200).

Almost surely, 2^1028921273 is an apocalyptic number.

It is an amenable number.

1028921273 is a deficient number, since it is larger than the sum of its proper divisors (179527).

1028921273 is an equidigital number, since it uses as much as digits as its factorization.

1028921273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179526.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1028921273 is about 32076.8027240871. The cubic root of 1028921273 is about 1009.5489516239.

The spelling of 1028921273 in words is "one billion, twenty-eight million, nine hundred twenty-one thousand, two hundred seventy-three".