2531144221 has 2 divisors, whose sum is σ = 2531144222. Its totient is φ = 2531144220.

The previous prime is 2531144201. The next prime is 2531144233. The reversal of 2531144221 is 1224411352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1277276121 + 1253868100 = 35739^2 + 35410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531144221 - 2⁹ = 2531143709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531144201) 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, 1265572110 + 1265572111.

It is an arithmetic number, because the mean of its divisors is an integer number (1265572111).

Almost surely, 2^2531144221 is an apocalyptic number.

It is an amenable number.

2531144221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531144221 is an equidigital number, since it uses as much as digits as its factorization.

2531144221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 2531144221 is about 50310.4782426087. The cubic root of 2531144221 is about 1362.8214603400.

Adding to 2531144221 its reverse (1224411352), we get a palindrome (3755555573).

The spelling of 2531144221 in words is "two billion, five hundred thirty-one million, one hundred forty-four thousand, two hundred twenty-one".