31243450247 has 2 divisors, whose sum is σ = 31243450248. Its totient is φ = 31243450246.

The previous prime is 31243450193. The next prime is 31243450253. The reversal of 31243450247 is 74205434213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31243450247 - 2²⁴ = 31226673031 is a prime.

It is a super-2 number, since 2×31243450247² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31243150247) 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, 15621725123 + 15621725124.

It is an arithmetic number, because the mean of its divisors is an integer number (15621725124).

Almost surely, 2^31243450247 is an apocalyptic number.

31243450247 is a deficient number, since it is larger than the sum of its proper divisors (1).

31243450247 is an equidigital number, since it uses as much as digits as its factorization.

31243450247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 35.

The spelling of 31243450247 in words is "thirty-one billion, two hundred forty-three million, four hundred fifty thousand, two hundred forty-seven".