1321000109 has 16 divisors (see below), whose sum is σ = 1567327104. Its totient is φ = 1097544000.

The previous prime is 1321000081. The next prime is 1321000127. The reversal of 1321000109 is 9010001231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321000109 - 2¹² = 1320996013 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 (1321000129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31289 + ... + 60174.

It is an arithmetic number, because the mean of its divisors is an integer number (97957944).

Almost surely, 2^1321000109 is an apocalyptic number.

It is an amenable number.

1321000109 is a deficient number, since it is larger than the sum of its proper divisors (246326995).

1321000109 is a wasteful number, since it uses less digits than its factorization.

1321000109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91588.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1321000109 is about 36345.5651902677. The cubic root of 1321000109 is about 1097.2382811747.

The spelling of 1321000109 in words is "one billion, three hundred twenty-one million, one hundred nine", and thus it is an aban number.