5431331221 has 2 divisors, whose sum is σ = 5431331222. Its totient is φ = 5431331220.

The previous prime is 5431331219. The next prime is 5431331273. The reversal of 5431331221 is 1221331345.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4671722500 + 759608721 = 68350^2 + 27561^2 .

It is a cyclic number.

It is not a de Polignac number, because 5431331221 - 2¹ = 5431331219 is a prime.

Together with 5431331219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5431338221) 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, 2715665610 + 2715665611.

It is an arithmetic number, because the mean of its divisors is an integer number (2715665611).

Almost surely, 2^5431331221 is an apocalyptic number.

It is an amenable number.

5431331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5431331221 is an equidigital number, since it uses as much as digits as its factorization.

5431331221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 5431331221 is about 73697.5659096011. The cubic root of 5431331221 is about 1757.7971774787.

Adding to 5431331221 its reverse (1221331345), we get a palindrome (6652662566).

The spelling of 5431331221 in words is "five billion, four hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty-one".