1028212489 has 2 divisors, whose sum is σ = 1028212490. Its totient is φ = 1028212488.

The previous prime is 1028212483. The next prime is 1028212501. The reversal of 1028212489 is 9842128201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828979264 + 199233225 = 28792^2 + 14115^2 .

It is a cyclic number.

It is not a de Polignac number, because 1028212489 - 2³ = 1028212481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1028212481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514106244 + 514106245.

It is an arithmetic number, because the mean of its divisors is an integer number (514106245).

Almost surely, 2^1028212489 is an apocalyptic number.

It is an amenable number.

1028212489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028212489 is an equidigital number, since it uses as much as digits as its factorization.

1028212489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1028212489 is about 32065.7525874569. The cubic root of 1028212489 is about 1009.3170853217.

The spelling of 1028212489 in words is "one billion, twenty-eight million, two hundred twelve thousand, four hundred eighty-nine".