203671000081 has 2 divisors, whose sum is σ = 203671000082. Its totient is φ = 203671000080.

The previous prime is 203671000073. The next prime is 203671000177. The reversal of 203671000081 is 180000176302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132426849025 + 71244151056 = 363905^2 + 266916^2 .

It is a cyclic number.

It is not a de Polignac number, because 203671000081 - 2³ = 203671000073 is a prime.

It is a super-2 number, since 2×203671000081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203071000081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101835500040 + 101835500041.

It is an arithmetic number, because the mean of its divisors is an integer number (101835500041).

Almost surely, 2^203671000081 is an apocalyptic number.

It is an amenable number.

203671000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

203671000081 is an equidigital number, since it uses as much as digits as its factorization.

203671000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 203671000081 its reverse (180000176302), we get a palindrome (383671176383).

The spelling of 203671000081 in words is "two hundred three billion, six hundred seventy-one million, eighty-one", and thus it is an aban number.