31514512543981 has 2 divisors, whose sum is σ = 31514512543982. Its totient is φ = 31514512543980.

The previous prime is 31514512543979. The next prime is 31514512544023. The reversal of 31514512543981 is 18934521541513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30007289807881 + 1507222736100 = 5477891^2 + 1227690^2 .

It is a cyclic number.

It is not a de Polignac number, because 31514512543981 - 2¹ = 31514512543979 is a prime.

It is a super-2 number, since 2×31514512543981² (a number of 28 digits) contains 22 as substring.

Together with 31514512543979, 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 (31514512523981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15757256271990 + 15757256271991.

It is an arithmetic number, because the mean of its divisors is an integer number (15757256271991).

Almost surely, 2^{31514512543981} is an apocalyptic number.

It is an amenable number.

31514512543981 is a deficient number, since it is larger than the sum of its proper divisors (1).

31514512543981 is an equidigital number, since it uses as much as digits as its factorization.

31514512543981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592000, while the sum is 52.

The spelling of 31514512543981 in words is "thirty-one trillion, five hundred fourteen billion, five hundred twelve million, five hundred forty-three thousand, nine hundred eighty-one".