1026909649 has 2 divisors, whose sum is σ = 1026909650. Its totient is φ = 1026909648.

The previous prime is 1026909647. The next prime is 1026909659. The reversal of 1026909649 is 9469096201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 681210000 + 345699649 = 26100^2 + 18593^2 .

It is an emirp because it is prime and its reverse (9469096201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1026909649 - 2¹ = 1026909647 is a prime.

Together with 1026909647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1026909599 and 1026909608.

It is not a weakly prime, because it can be changed into another prime (1026909641) 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 as a sum of consecutive naturals, namely, 513454824 + 513454825.

It is an arithmetic number, because the mean of its divisors is an integer number (513454825).

Almost surely, 2^1026909649 is an apocalyptic number.

It is an amenable number.

1026909649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1026909649 is an equidigital number, since it uses as much as digits as its factorization.

1026909649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 1026909649 is about 32045.4310159810. The cubic root of 1026909649 is about 1008.8906058807.

The spelling of 1026909649 in words is "one billion, twenty-six million, nine hundred nine thousand, six hundred forty-nine".