321616697 has 4 divisors (see below), whose sum is σ = 322076196. Its totient is φ = 321157200.

The previous prime is 321616681. The next prime is 321616709. The reversal of 321616697 is 796616123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 796616123 = 3347 ⋅238009.

It can be written as a sum of positive squares in 2 ways, for example, as 284394496 + 37222201 = 16864^2 + 6101^2 .

It is a cyclic number.

It is not a de Polignac number, because 321616697 - 2⁴ = 321616681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321616627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228698 + ... + 230099.

It is an arithmetic number, because the mean of its divisors is an integer number (80519049).

Almost surely, 2^321616697 is an apocalyptic number.

It is an amenable number.

321616697 is a deficient number, since it is larger than the sum of its proper divisors (459499).

321616697 is an equidigital number, since it uses as much as digits as its factorization.

321616697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459498.

The product of its digits is 81648, while the sum is 41.

The square root of 321616697 is about 17933.6749440822. The cubic root of 321616697 is about 685.1403246717.

The spelling of 321616697 in words is "three hundred twenty-one million, six hundred sixteen thousand, six hundred ninety-seven".