321663109 has 4 divisors (see below), whose sum is σ = 321819616. Its totient is φ = 321506604.

The previous prime is 321663071. The next prime is 321663127. The reversal of 321663109 is 901366123.

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.

It is a cyclic number.

It is not a de Polignac number, because 321663109 - 2¹³ = 321654917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321663149) 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 3 ways as a sum of consecutive naturals, for example, 75129 + ... + 79294.

It is an arithmetic number, because the mean of its divisors is an integer number (80454904).

Almost surely, 2^321663109 is an apocalyptic number.

It is an amenable number.

321663109 is a deficient number, since it is larger than the sum of its proper divisors (156507).

321663109 is a wasteful number, since it uses less digits than its factorization.

321663109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156506.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 321663109 is about 17934.9688876229. The cubic root of 321663109 is about 685.1732802609.

The spelling of 321663109 in words is "three hundred twenty-one million, six hundred sixty-three thousand, one hundred nine".