131000321 has 2 divisors, whose sum is σ = 131000322. Its totient is φ = 131000320.

The previous prime is 131000293. The next prime is 131000357. The reversal of 131000321 is 123000131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126000625 + 4999696 = 11225^2 + 2236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131000321 is a prime.

It is a super-2 number, since 2×131000321² = 34322168204206082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131000381) 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 as a sum of consecutive naturals, namely, 65500160 + 65500161.

It is an arithmetic number, because the mean of its divisors is an integer number (65500161).

Almost surely, 2^131000321 is an apocalyptic number.

It is an amenable number.

131000321 is a deficient number, since it is larger than the sum of its proper divisors (1).

131000321 is an equidigital number, since it uses as much as digits as its factorization.

131000321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 131000321 is about 11445.5371652011. The cubic root of 131000321 is about 507.8757226424.

Adding to 131000321 its reverse (123000131), we get a palindrome (254000452).

The spelling of 131000321 in words is "one hundred thirty-one million, three hundred twenty-one", and thus it is an aban number.