31243450253 has 2 divisors, whose sum is σ = 31243450254. Its totient is φ = 31243450252.

The previous prime is 31243450247. The next prime is 31243450279. The reversal of 31243450253 is 35205434213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16568066089 + 14675384164 = 128717^2 + 121142^2 .

It is an emirp because it is prime and its reverse (35205434213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31243450253 - 2¹⁴ = 31243433869 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31243459253) 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, 15621725126 + 15621725127.

It is an arithmetic number, because the mean of its divisors is an integer number (15621725127).

Almost surely, 2^31243450253 is an apocalyptic number.

It is an amenable number.

31243450253 is a deficient number, since it is larger than the sum of its proper divisors (1).

31243450253 is an equidigital number, since it uses as much as digits as its factorization.

31243450253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 31243450253 its reverse (35205434213), we get a palindrome (66448884466).

The spelling of 31243450253 in words is "thirty-one billion, two hundred forty-three million, four hundred fifty thousand, two hundred fifty-three".