31103131023121 has 2 divisors, whose sum is σ = 31103131023122. Its totient is φ = 31103131023120.

The previous prime is 31103131023113. The next prime is 31103131023149. The reversal of 31103131023121 is 12132013130113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27540244494400 + 3562886528721 = 5247880^2 + 1887561^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103131023121 - 2³ = 31103131023113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31103131023092 and 31103131023101.

It is not a weakly prime, because it can be changed into another prime (31103131020121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15551565511560 + 15551565511561.

It is an arithmetic number, because the mean of its divisors is an integer number (15551565511561).

Almost surely, 2^{31103131023121} is an apocalyptic number.

It is an amenable number.

31103131023121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31103131023121 is an equidigital number, since it uses as much as digits as its factorization.

31103131023121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31103131023121 its reverse (12132013130113), we get a palindrome (43235144153234).

The spelling of 31103131023121 in words is "thirty-one trillion, one hundred three billion, one hundred thirty-one million, twenty-three thousand, one hundred twenty-one".