31113232103581 has 2 divisors, whose sum is σ = 31113232103582. Its totient is φ = 31113232103580.

The previous prime is 31113232103537. The next prime is 31113232103617. The reversal of 31113232103581 is 18530123231113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24711497176356 + 6401734927225 = 4971066^2 + 2530165^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113232103581 - 2⁹ = 31113232103069 is a prime.

It is a super-2 number, since 2×31113232103581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113232103081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556616051790 + 15556616051791.

It is an arithmetic number, because the mean of its divisors is an integer number (15556616051791).

Almost surely, 2^{31113232103581} is an apocalyptic number.

It is an amenable number.

31113232103581 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113232103581 is an equidigital number, since it uses as much as digits as its factorization.

31113232103581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 31113232103581 its reverse (18530123231113), we get a palindrome (49643355334694).

The spelling of 31113232103581 in words is "thirty-one trillion, one hundred thirteen billion, two hundred thirty-two million, one hundred three thousand, five hundred eighty-one".