1028823421 has 2 divisors, whose sum is σ = 1028823422. Its totient is φ = 1028823420.

The previous prime is 1028823379. The next prime is 1028823449. The reversal of 1028823421 is 1243288201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635594521 + 393228900 = 25211^2 + 19830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028823421 - 2¹¹ = 1028821373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1028823451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514411710 + 514411711.

It is an arithmetic number, because the mean of its divisors is an integer number (514411711).

Almost surely, 2^1028823421 is an apocalyptic number.

It is an amenable number.

1028823421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028823421 is an equidigital number, since it uses as much as digits as its factorization.

1028823421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 1028823421 is about 32075.2774111152. The cubic root of 1028823421 is about 1009.5169473885.

The spelling of 1028823421 in words is "one billion, twenty-eight million, eight hundred twenty-three thousand, four hundred twenty-one".