1321800685 has 8 divisors (see below), whose sum is σ = 1655124480. Its totient is φ = 1011464784.

The previous prime is 1321800679. The next prime is 1321800719. The reversal of 1321800685 is 5860081231.

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 1321800685 - 2²³ = 1313412077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321800685.

It is a congruent number.

It is an unprimeable number.

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, 5746845 + ... + 5747074.

It is an arithmetic number, because the mean of its divisors is an integer number (206890560).

Almost surely, 2^1321800685 is an apocalyptic number.

It is an amenable number.

1321800685 is a deficient number, since it is larger than the sum of its proper divisors (333323795).

1321800685 is a wasteful number, since it uses less digits than its factorization.

1321800685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11493947.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1321800685 is about 36356.5769153258. The cubic root of 1321800685 is about 1097.4598923705.

The spelling of 1321800685 in words is "one billion, three hundred twenty-one million, eight hundred thousand, six hundred eighty-five".