31121200133 has 2 divisors, whose sum is σ = 31121200134. Its totient is φ = 31121200132.

The previous prime is 31121200109. The next prime is 31121200139. The reversal of 31121200133 is 33100212113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16977568804 + 14143631329 = 130298^2 + 118927^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121200133 - 2⁸ = 31121199877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121200139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560600066 + 15560600067.

It is an arithmetic number, because the mean of its divisors is an integer number (15560600067).

Almost surely, 2^31121200133 is an apocalyptic number.

It is an amenable number.

31121200133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121200133 is an equidigital number, since it uses as much as digits as its factorization.

31121200133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31121200133 its reverse (33100212113), we get a palindrome (64221412246).

The spelling of 31121200133 in words is "thirty-one billion, one hundred twenty-one million, two hundred thousand, one hundred thirty-three".