20203101231161 has 2 divisors, whose sum is σ = 20203101231162. Its totient is φ = 20203101231160.

The previous prime is 20203101231139. The next prime is 20203101231199. The reversal of 20203101231161 is 16113210130202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10633860121600 + 9569241109561 = 3260960^2 + 3093419^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203101231161 - 2⁶ = 20203101231097 is a prime.

It is a super-2 number, since 2×20203101231161² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20203101231961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101550615580 + 10101550615581.

It is an arithmetic number, because the mean of its divisors is an integer number (10101550615581).

Almost surely, 2^{20203101231161} is an apocalyptic number.

It is an amenable number.

20203101231161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203101231161 is an equidigital number, since it uses as much as digits as its factorization.

20203101231161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 20203101231161 its reverse (16113210130202), we get a palindrome (36316311361363).

The spelling of 20203101231161 in words is "twenty trillion, two hundred three billion, one hundred one million, two hundred thirty-one thousand, one hundred sixty-one".