1026289109 has 4 divisors (see below), whose sum is σ = 1035880704. Its totient is φ = 1016697516.

The previous prime is 1026289097. The next prime is 1026289139. The reversal of 1026289109 is 9019826201.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1026289109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026289139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4795637 + ... + 4795850.

It is an arithmetic number, because the mean of its divisors is an integer number (258970176).

Almost surely, 2^1026289109 is an apocalyptic number.

It is an amenable number.

1026289109 is a deficient number, since it is larger than the sum of its proper divisors (9591595).

1026289109 is an equidigital number, since it uses as much as digits as its factorization.

1026289109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9591594.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1026289109 is about 32035.7473613462. The cubic root of 1026289109 is about 1008.6873477772.

The spelling of 1026289109 in words is "one billion, twenty-six million, two hundred eighty-nine thousand, one hundred nine".