31561310305243 has 2 divisors, whose sum is σ = 31561310305244. Its totient is φ = 31561310305242.

The previous prime is 31561310305219. The next prime is 31561310305249. The reversal of 31561310305243 is 34250301316513.

It is a strong prime.

It is an emirp because it is prime and its reverse (34250301316513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31561310305243 - 2⁵ = 31561310305211 is a prime.

It is a super-2 number, since 2×31561310305243² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31561310305249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15780655152621 + 15780655152622.

It is an arithmetic number, because the mean of its divisors is an integer number (15780655152622).

Almost surely, 2^{31561310305243} is an apocalyptic number.

31561310305243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31561310305243 is an equidigital number, since it uses as much as digits as its factorization.

31561310305243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 37.

The spelling of 31561310305243 in words is "thirty-one trillion, five hundred sixty-one billion, three hundred ten million, three hundred five thousand, two hundred forty-three".