1321818985 has 8 divisors (see below), whose sum is σ = 1640878920. Its totient is φ = 1020991104.

The previous prime is 1321818959. The next prime is 1321818989. The reversal of 1321818985 is 5898181231.

It can be written as a sum of positive squares in 4 ways, for example, as 7683984 + 1314135001 = 2772^2 + 36251^2 .

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 1321818985 - 2⁹ = 1321818473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321818989) 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, 4557852 + ... + 4558141.

It is an arithmetic number, because the mean of its divisors is an integer number (205109865).

Almost surely, 2^1321818985 is an apocalyptic number.

It is an amenable number.

1321818985 is a deficient number, since it is larger than the sum of its proper divisors (319059935).

1321818985 is an equidigital number, since it uses as much as digits as its factorization.

1321818985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116027.

The product of its digits is 138240, while the sum is 46.

The square root of 1321818985 is about 36356.8285883134. The cubic root of 1321818985 is about 1097.4649570330.

The spelling of 1321818985 in words is "one billion, three hundred twenty-one million, eight hundred eighteen thousand, nine hundred eighty-five".