1321447685 has 4 divisors (see below), whose sum is σ = 1585737228. Its totient is φ = 1057158144.

The previous prime is 1321447643. The next prime is 1321447691. The reversal of 1321447685 is 5867441231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259274404 + 1062173281 = 16102^2 + 32591^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321447685 - 2¹⁶ = 1321382149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132144764 + ... + 132144773.

It is an arithmetic number, because the mean of its divisors is an integer number (396434307).

Almost surely, 2^1321447685 is an apocalyptic number.

It is an amenable number.

1321447685 is a deficient number, since it is larger than the sum of its proper divisors (264289543).

1321447685 is an equidigital number, since it uses as much as digits as its factorization.

1321447685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264289542.

The product of its digits is 161280, while the sum is 41.

The square root of 1321447685 is about 36351.7218986942. The cubic root of 1321447685 is about 1097.3621878178.

The spelling of 1321447685 in words is "one billion, three hundred twenty-one million, four hundred forty-seven thousand, six hundred eighty-five".