321992993 has 4 divisors (see below), whose sum is σ = 367992000. Its totient is φ = 275993988.

The previous prime is 321992977. The next prime is 321993013. The reversal of 321992993 is 399299123.

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 321992993 - 2⁴ = 321992977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321992933) 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, 22999493 + ... + 22999506.

It is an arithmetic number, because the mean of its divisors is an integer number (91998000).

Almost surely, 2^321992993 is an apocalyptic number.

It is an amenable number.

321992993 is a deficient number, since it is larger than the sum of its proper divisors (45999007).

321992993 is an equidigital number, since it uses as much as digits as its factorization.

321992993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45999006.

The product of its digits is 236196, while the sum is 47.

The square root of 321992993 is about 17944.1632014424. The cubic root of 321992993 is about 685.4074284239.

The spelling of 321992993 in words is "three hundred twenty-one million, nine hundred ninety-two thousand, nine hundred ninety-three".