203121243161 has 2 divisors, whose sum is σ = 203121243162. Its totient is φ = 203121243160.

The previous prime is 203121243133. The next prime is 203121243179. The reversal of 203121243161 is 161342121302.

It is a happy number.

203121243161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198431047936 + 4690195225 = 445456^2 + 68485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203121243161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 203121243161.

It is not a weakly prime, because it can be changed into another prime (203121243181) 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, 101560621580 + 101560621581.

It is an arithmetic number, because the mean of its divisors is an integer number (101560621581).

Almost surely, 2^203121243161 is an apocalyptic number.

It is an amenable number.

203121243161 is a deficient number, since it is larger than the sum of its proper divisors (1).

203121243161 is an equidigital number, since it uses as much as digits as its factorization.

203121243161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 203121243161 its reverse (161342121302), we get a palindrome (364463364463).

The spelling of 203121243161 in words is "two hundred three billion, one hundred twenty-one million, two hundred forty-three thousand, one hundred sixty-one".