973681321 has 4 divisors (see below), whose sum is σ = 973965952. Its totient is φ = 973396692.

The previous prime is 973681301. The next prime is 973681343. The reversal of 973681321 is 123186379.

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 973681321 - 2⁷ = 973681193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (973681301) 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, 137121 + ... + 144046.

It is an arithmetic number, because the mean of its divisors is an integer number (243491488).

Almost surely, 2^973681321 is an apocalyptic number.

It is an amenable number.

973681321 is a deficient number, since it is larger than the sum of its proper divisors (284631).

973681321 is a wasteful number, since it uses less digits than its factorization.

973681321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284630.

The product of its digits is 54432, while the sum is 40.

The square root of 973681321 is about 31203.8670840651. The cubic root of 973681321 is about 991.1489978915.

It can be divided in two parts, 97368 and 1321, that added together give a palindrome (98689).

The spelling of 973681321 in words is "nine hundred seventy-three million, six hundred eighty-one thousand, three hundred twenty-one".