321772993 has 4 divisors (see below), whose sum is σ = 321814528. Its totient is φ = 321731460.

The previous prime is 321772973. The next prime is 321773027. The reversal of 321772993 is 399277123.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321772993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321772943) 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, 5313 + ... + 25918.

It is an arithmetic number, because the mean of its divisors is an integer number (80453632).

Almost surely, 2^321772993 is an apocalyptic number.

It is an amenable number.

321772993 is a deficient number, since it is larger than the sum of its proper divisors (41535).

321772993 is a wasteful number, since it uses less digits than its factorization.

321772993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41534.

The product of its digits is 142884, while the sum is 43.

The square root of 321772993 is about 17938.0320269532. The cubic root of 321772993 is about 685.2512925321.

The spelling of 321772993 in words is "three hundred twenty-one million, seven hundred seventy-two thousand, nine hundred ninety-three".