20111433131 has 2 divisors, whose sum is σ = 20111433132. Its totient is φ = 20111433130.

The previous prime is 20111433113. The next prime is 20111433187. The reversal of 20111433131 is 13133411102.

Together with previous prime (20111433113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111433131 - 2¹⁴ = 20111416747 is a prime.

It is a super-2 number, since 2×20111433131² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20111433031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055716565 + 10055716566.

It is an arithmetic number, because the mean of its divisors is an integer number (10055716566).

Almost surely, 2^20111433131 is an apocalyptic number.

20111433131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111433131 is an equidigital number, since it uses as much as digits as its factorization.

20111433131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20111433131 its reverse (13133411102), we get a palindrome (33244844233).

The spelling of 20111433131 in words is "twenty billion, one hundred eleven million, four hundred thirty-three thousand, one hundred thirty-one".