321131161 has 8 divisors (see below), whose sum is σ = 350572040. Its totient is φ = 292367232.

The previous prime is 321131117. The next prime is 321131171. The reversal of 321131161 is 161131123.

It can be written as a sum of positive squares in 4 ways, for example, as 48385936 + 272745225 = 6956^2 + 16515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321131161 - 2¹¹ = 321129113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321131171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168246 + ... + 170143.

It is an arithmetic number, because the mean of its divisors is an integer number (43821505).

Almost surely, 2^321131161 is an apocalyptic number.

It is an amenable number.

321131161 is a deficient number, since it is larger than the sum of its proper divisors (29440879).

321131161 is a wasteful number, since it uses less digits than its factorization.

321131161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338475.

The product of its digits is 108, while the sum is 19.

The square root of 321131161 is about 17920.1328399094. The cubic root of 321131161 is about 684.7953717727.

Adding to 321131161 its reverse (161131123), we get a palindrome (482262284).

The spelling of 321131161 in words is "three hundred twenty-one million, one hundred thirty-one thousand, one hundred sixty-one".