1028689019 has 2 divisors, whose sum is σ = 1028689020. Its totient is φ = 1028689018.

The previous prime is 1028688959. The next prime is 1028689021. The reversal of 1028689019 is 9109868201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028689019 is a prime.

It is a super-2 number, since 2×1028689019² = 2116402195622364722, which contains 22 as substring.

Together with 1028689021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1028689049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514344509 + 514344510.

It is an arithmetic number, because the mean of its divisors is an integer number (514344510).

Almost surely, 2^1028689019 is an apocalyptic number.

1028689019 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028689019 is an equidigital number, since it uses as much as digits as its factorization.

1028689019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 1028689019 is about 32073.1822399961. The cubic root of 1028689019 is about 1009.4729855182.

The spelling of 1028689019 in words is "one billion, twenty-eight million, six hundred eighty-nine thousand, nineteen".