201031323161 has 2 divisors, whose sum is σ = 201031323162. Its totient is φ = 201031323160.

The previous prime is 201031323131. The next prime is 201031323187. The reversal of 201031323161 is 161323130102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192760512025 + 8270811136 = 439045^2 + 90944^2 .

It is a cyclic number.

It is not a de Polignac number, because 201031323161 - 2³⁰ = 199957581337 is a prime.

It is not a weakly prime, because it can be changed into another prime (201031323131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100515661580 + 100515661581.

It is an arithmetic number, because the mean of its divisors is an integer number (100515661581).

Almost surely, 2^201031323161 is an apocalyptic number.

It is an amenable number.

201031323161 is a deficient number, since it is larger than the sum of its proper divisors (1).

201031323161 is an equidigital number, since it uses as much as digits as its factorization.

201031323161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 201031323161 its reverse (161323130102), we get a palindrome (362354453263).

The spelling of 201031323161 in words is "two hundred one billion, thirty-one million, three hundred twenty-three thousand, one hundred sixty-one".