3131221241 has 2 divisors, whose sum is σ = 3131221242. Its totient is φ = 3131221240.

The previous prime is 3131221201. The next prime is 3131221253. The reversal of 3131221241 is 1421221313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3025440016 + 105781225 = 55004^2 + 10285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131221241 is a prime.

It is not a weakly prime, because it can be changed into another prime (3131221201) 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, 1565610620 + 1565610621.

It is an arithmetic number, because the mean of its divisors is an integer number (1565610621).

Almost surely, 2^3131221241 is an apocalyptic number.

It is an amenable number.

3131221241 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131221241 is an equidigital number, since it uses as much as digits as its factorization.

3131221241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 3131221241 is about 55957.3162419357. The cubic root of 3131221241 is about 1462.9784136839.

Adding to 3131221241 its reverse (1421221313), we get a palindrome (4552442554).

The spelling of 3131221241 in words is "three billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred forty-one".