1009435681861 has 8 divisors (see below), whose sum is σ = 1066657409280. Its totient is φ = 953325056112.

The previous prime is 1009435681841. The next prime is 1009435681873. The reversal of 1009435681861 is 1681865349001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1009435681861 - 2⁵ = 1009435681829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1009435681799 and 1009435681808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1009435681841) 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 7 ways as a sum of consecutive naturals, for example, 277773550 + ... + 277777183.

It is an arithmetic number, because the mean of its divisors is an integer number (133332176160).

Almost surely, 2^{1009435681861} is an apocalyptic number.

It is an amenable number.

1009435681861 is a deficient number, since it is larger than the sum of its proper divisors (57221727419).

1009435681861 is an equidigital number, since it uses as much as digits as its factorization.

1009435681861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555550835.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 1009435681861 in words is "one trillion, nine billion, four hundred thirty-five million, six hundred eighty-one thousand, eight hundred sixty-one".