20133131111 has 2 divisors, whose sum is σ = 20133131112. Its totient is φ = 20133131110.

The previous prime is 20133131107. The next prime is 20133131143. The reversal of 20133131111 is 11113133102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20133131111 - 2² = 20133131107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20133131111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20133131911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066565555 + 10066565556.

It is an arithmetic number, because the mean of its divisors is an integer number (10066565556).

Almost surely, 2^20133131111 is an apocalyptic number.

20133131111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133131111 is an equidigital number, since it uses as much as digits as its factorization.

20133131111 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 17.

Adding to 20133131111 its reverse (11113133102), we get a palindrome (31246264213).

The spelling of 20133131111 in words is "twenty billion, one hundred thirty-three million, one hundred thirty-one thousand, one hundred eleven".