20133511091 has 2 divisors, whose sum is σ = 20133511092. Its totient is φ = 20133511090.

The previous prime is 20133511067. The next prime is 20133511093. The reversal of 20133511091 is 19011533102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20133511091 - 2³⁴ = 2953641907 is a prime.

Together with 20133511093, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20133511091.

It is not a weakly prime, because it can be changed into another prime (20133511093) 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, 10066755545 + 10066755546.

It is an arithmetic number, because the mean of its divisors is an integer number (10066755546).

Almost surely, 2^20133511091 is an apocalyptic number.

20133511091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133511091 is an equidigital number, since it uses as much as digits as its factorization.

20133511091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The spelling of 20133511091 in words is "twenty billion, one hundred thirty-three million, five hundred eleven thousand, ninety-one".