31543212523481 has 2 divisors, whose sum is σ = 31543212523482. Its totient is φ = 31543212523480.

The previous prime is 31543212523453. The next prime is 31543212523507. The reversal of 31543212523481 is 18432521234513.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29027753083081 + 2515459440400 = 5387741^2 + 1586020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31543212523481 is a prime.

It is a super-2 number, since 2×31543212523481² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31543212523981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771606261740 + 15771606261741.

It is an arithmetic number, because the mean of its divisors is an integer number (15771606261741).

Almost surely, 2^{31543212523481} is an apocalyptic number.

It is an amenable number.

31543212523481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31543212523481 is an equidigital number, since it uses as much as digits as its factorization.

31543212523481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 691200, while the sum is 44.

Adding to 31543212523481 its reverse (18432521234513), we get a palindrome (49975733757994).

The spelling of 31543212523481 in words is "thirty-one trillion, five hundred forty-three billion, two hundred twelve million, five hundred twenty-three thousand, four hundred eighty-one".