31111020133 has 2 divisors, whose sum is σ = 31111020134. Its totient is φ = 31111020132.

The previous prime is 31111020131. The next prime is 31111020151. The reversal of 31111020133 is 33102011113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27074069764 + 4036950369 = 164542^2 + 63537^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111020133 - 2¹ = 31111020131 is a prime.

Together with 31111020131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111020131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555510066 + 15555510067.

It is an arithmetic number, because the mean of its divisors is an integer number (15555510067).

Almost surely, 2^31111020133 is an apocalyptic number.

It is an amenable number.

31111020133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111020133 is an equidigital number, since it uses as much as digits as its factorization.

31111020133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31111020133 its reverse (33102011113), we get a palindrome (64213031246).

The spelling of 31111020133 in words is "thirty-one billion, one hundred eleven million, twenty thousand, one hundred thirty-three".