321261643 has 8 divisors (see below), whose sum is σ = 329142528. Its totient is φ = 313399464.

The previous prime is 321261607. The next prime is 321261679. The reversal of 321261643 is 346162123.

It is an interprime number because it is at equal distance from previous prime (321261607) and next prime (321261679).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321261643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321267643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33930 + ... + 42352.

It is an arithmetic number, because the mean of its divisors is an integer number (41142816).

Almost surely, 2^321261643 is an apocalyptic number.

321261643 is a deficient number, since it is larger than the sum of its proper divisors (7880885).

321261643 is an equidigital number, since it uses as much as digits as its factorization.

321261643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9353.

The product of its digits is 5184, while the sum is 28.

The square root of 321261643 is about 17923.7731239826. The cubic root of 321261643 is about 684.8881078893. Note that the first 3 decimals are identical.

The spelling of 321261643 in words is "three hundred twenty-one million, two hundred sixty-one thousand, six hundred forty-three".