1026009689 has 4 divisors (see below), whose sum is σ = 1027003956. Its totient is φ = 1025015424.

The previous prime is 1026009683. The next prime is 1026009703. The reversal of 1026009689 is 9869006201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9869006201 = 19 ⋅519421379.

It can be written as a sum of positive squares in 2 ways, for example, as 827425225 + 198584464 = 28765^2 + 14092^2 .

It is a cyclic number.

It is not a de Polignac number, because 1026009689 - 2²⁴ = 1009232473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1026009683) 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, 495584 + ... + 497649.

It is an arithmetic number, because the mean of its divisors is an integer number (256750989).

Almost surely, 2^1026009689 is an apocalyptic number.

It is an amenable number.

1026009689 is a deficient number, since it is larger than the sum of its proper divisors (994267).

1026009689 is an equidigital number, since it uses as much as digits as its factorization.

1026009689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994266.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 1026009689 is about 32031.3859987357. The cubic root of 1026009689 is about 1008.5957969010.

The spelling of 1026009689 in words is "one billion, twenty-six million, nine thousand, six hundred eighty-nine".