321456997 has 4 divisors (see below), whose sum is σ = 324461376. Its totient is φ = 318452620.

The previous prime is 321456943. The next prime is 321457001. The reversal of 321456997 is 799654123.

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: 799654123 = 251 ⋅3185873.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321456997 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 (321456907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502029 + ... + 1502242.

It is an arithmetic number, because the mean of its divisors is an integer number (81115344).

Almost surely, 2^321456997 is an apocalyptic number.

It is an amenable number.

321456997 is a deficient number, since it is larger than the sum of its proper divisors (3004379).

321456997 is a wasteful number, since it uses less digits than its factorization.

321456997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004378.

The product of its digits is 408240, while the sum is 46.

The square root of 321456997 is about 17929.2218738014. The cubic root of 321456997 is about 685.0269028807.

The spelling of 321456997 in words is "three hundred twenty-one million, four hundred fifty-six thousand, nine hundred ninety-seven".