1009861309 has 4 divisors (see below), whose sum is σ = 1010652160. Its totient is φ = 1009070460.

The previous prime is 1009861297. The next prime is 1009861339. The reversal of 1009861309 is 9031689001.

1009861309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 1009861309 - 2¹¹ = 1009859261 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 (1009861339) 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, 393507 + ... + 396064.

It is an arithmetic number, because the mean of its divisors is an integer number (252663040).

Almost surely, 2^1009861309 is an apocalyptic number.

It is an amenable number.

1009861309 is a deficient number, since it is larger than the sum of its proper divisors (790851).

1009861309 is an equidigital number, since it uses as much as digits as its factorization.

1009861309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790850.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1009861309 is about 31778.3150749060. The cubic root of 1009861309 is about 1003.2763567630.

The spelling of 1009861309 in words is "one billion, nine million, eight hundred sixty-one thousand, three hundred nine".