1321845361 has 4 divisors (see below), whose sum is σ = 1328488000. Its totient is φ = 1315202724.

The previous prime is 1321845359. The next prime is 1321845373. The reversal of 1321845361 is 1635481231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1635481231 = 47 ⋅34797473.

It is a cyclic number.

It is not a de Polignac number, because 1321845361 - 2¹ = 1321845359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321885361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3321021 + ... + 3321418.

It is an arithmetic number, because the mean of its divisors is an integer number (332122000).

Almost surely, 2^1321845361 is an apocalyptic number.

It is an amenable number.

1321845361 is a deficient number, since it is larger than the sum of its proper divisors (6642639).

1321845361 is an equidigital number, since it uses as much as digits as its factorization.

1321845361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642638.

The product of its digits is 17280, while the sum is 34.

The square root of 1321845361 is about 36357.1913244134. The cubic root of 1321845361 is about 1097.4722567071.

The spelling of 1321845361 in words is "one billion, three hundred twenty-one million, eight hundred forty-five thousand, three hundred sixty-one".