321331409 has 4 divisors (see below), whose sum is σ = 367235904. Its totient is φ = 275426916.

The previous prime is 321331349. The next prime is 321331427. The reversal of 321331409 is 904133123.

It is a happy number.

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: 904133123 = 20507 ⋅44089.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321331409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321331499) 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, 22952237 + ... + 22952250.

It is an arithmetic number, because the mean of its divisors is an integer number (91808976).

Almost surely, 2^321331409 is an apocalyptic number.

It is an amenable number.

321331409 is a deficient number, since it is larger than the sum of its proper divisors (45904495).

321331409 is an equidigital number, since it uses as much as digits as its factorization.

321331409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45904494.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 321331409 is about 17925.7192045396. The cubic root of 321331409 is about 684.9376816520.

The spelling of 321331409 in words is "three hundred twenty-one million, three hundred thirty-one thousand, four hundred nine".