201019998173 has 2 divisors, whose sum is σ = 201019998174. Its totient is φ = 201019998172.

The previous prime is 201019998163. The next prime is 201019998191. The reversal of 201019998173 is 371899910102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194726273284 + 6293724889 = 441278^2 + 79333^2 .

It is a cyclic number.

It is not a de Polignac number, because 201019998173 - 2¹⁶ = 201019932637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201019998163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100509999086 + 100509999087.

It is an arithmetic number, because the mean of its divisors is an integer number (100509999087).

Almost surely, 2^201019998173 is an apocalyptic number.

It is an amenable number.

201019998173 is a deficient number, since it is larger than the sum of its proper divisors (1).

201019998173 is an equidigital number, since it uses as much as digits as its factorization.

201019998173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 201019998173 in words is "two hundred one billion, nineteen million, nine hundred ninety-eight thousand, one hundred seventy-three".