1321797685 has 64 divisors (see below), whose sum is σ = 1909039104. Its totient is φ = 869068800.

The previous prime is 1321797679. The next prime is 1321797703. The reversal of 1321797685 is 5867971231.

It is a happy number.

It is not a de Polignac number, because 1321797685 - 2¹³ = 1321789493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1609575 + ... + 1610395.

It is an arithmetic number, because the mean of its divisors is an integer number (29828736).

Almost surely, 2^1321797685 is an apocalyptic number.

It is an amenable number.

1321797685 is a deficient number, since it is larger than the sum of its proper divisors (587241419).

1321797685 is a wasteful number, since it uses less digits than its factorization.

1321797685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934.

The product of its digits is 635040, while the sum is 49.

The square root of 1321797685 is about 36356.5356572928. The cubic root of 1321797685 is about 1097.4590620935.

The spelling of 1321797685 in words is "one billion, three hundred twenty-one million, seven hundred ninety-seven thousand, six hundred eighty-five".