31155223512104 has 8 divisors (see below), whose sum is σ = 58416044085210. Its totient is φ = 15577611756048.

The previous prime is 31155223512103. The next prime is 31155223512109. The reversal of 31155223512104 is 40121532255113.

It can be written as a sum of positive squares in only one way, i.e., 30852492468004 + 302731044100 = 5554502^2 + 550210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (31155223512103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1947201469499 + ... + 1947201469514.

Almost surely, 2^{31155223512104} is an apocalyptic number.

It is an amenable number.

31155223512104 is a deficient number, since it is larger than the sum of its proper divisors (27260820573106).

31155223512104 is a wasteful number, since it uses less digits than its factorization.

31155223512104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894402939019 (or 3894402939015 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 31155223512104 its reverse (40121532255113), we get a palindrome (71276755767217).

The spelling of 31155223512104 in words is "thirty-one trillion, one hundred fifty-five billion, two hundred twenty-three million, five hundred twelve thousand, one hundred four".