3131420321 has 2 divisors, whose sum is σ = 3131420322. Its totient is φ = 3131420320.

The previous prime is 3131420311. The next prime is 3131420323. The reversal of 3131420321 is 1230241313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3123580321 + 7840000 = 55889^2 + 2800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131420321 is a prime.

Together with 3131420323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3131420293 and 3131420302.

It is not a weakly prime, because it can be changed into another prime (3131420323) 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 as a sum of consecutive naturals, namely, 1565710160 + 1565710161.

It is an arithmetic number, because the mean of its divisors is an integer number (1565710161).

Almost surely, 2^3131420321 is an apocalyptic number.

It is an amenable number.

3131420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131420321 is an equidigital number, since it uses as much as digits as its factorization.

3131420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3131420321 is about 55959.0950695238. The cubic root of 3131420321 is about 1463.0094179416.

Adding to 3131420321 its reverse (1230241313), we get a palindrome (4361661634).

The spelling of 3131420321 in words is "three billion, one hundred thirty-one million, four hundred twenty thousand, three hundred twenty-one".