20563161131 has 2 divisors, whose sum is σ = 20563161132. Its totient is φ = 20563161130.

The previous prime is 20563161097. The next prime is 20563161133. The reversal of 20563161131 is 13116136502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20563161131 - 2³⁰ = 19489419307 is a prime.

It is a super-2 number, since 2×20563161131² (a number of 21 digits) contains 22 as substring.

Together with 20563161133, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20563161094 and 20563161103.

It is not a weakly prime, because it can be changed into another prime (20563161133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281580565 + 10281580566.

It is an arithmetic number, because the mean of its divisors is an integer number (10281580566).

Almost surely, 2^20563161131 is an apocalyptic number.

20563161131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20563161131 is an equidigital number, since it uses as much as digits as its factorization.

20563161131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 20563161131 its reverse (13116136502), we get a palindrome (33679297633).

The spelling of 20563161131 in words is "twenty billion, five hundred sixty-three million, one hundred sixty-one thousand, one hundred thirty-one".