321218879 has 2 divisors, whose sum is σ = 321218880. Its totient is φ = 321218878.

The previous prime is 321218873. The next prime is 321218917. The reversal of 321218879 is 978812123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321218879 - 2²⁴ = 304441663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321218873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160609439 + 160609440.

It is an arithmetic number, because the mean of its divisors is an integer number (160609440).

Almost surely, 2^321218879 is an apocalyptic number.

321218879 is a deficient number, since it is larger than the sum of its proper divisors (1).

321218879 is an equidigital number, since it uses as much as digits as its factorization.

321218879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 321218879 is about 17922.5801434950. The cubic root of 321218879 is about 684.8577174424.

The spelling of 321218879 in words is "three hundred twenty-one million, two hundred eighteen thousand, eight hundred seventy-nine".