203117081 has 2 divisors, whose sum is σ = 203117082. Its totient is φ = 203117080.

The previous prime is 203117077. The next prime is 203117099. The reversal of 203117081 is 180711302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132825625 + 70291456 = 11525^2 + 8384^2 .

It is a cyclic number.

It is not a de Polignac number, because 203117081 - 2² = 203117077 is a prime.

It is a super-2 number, since 2×203117081² = 82513097187921122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (203117021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101558540 + 101558541.

It is an arithmetic number, because the mean of its divisors is an integer number (101558541).

Almost surely, 2^203117081 is an apocalyptic number.

It is an amenable number.

203117081 is a deficient number, since it is larger than the sum of its proper divisors (1).

203117081 is an equidigital number, since it uses as much as digits as its factorization.

203117081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 203117081 is about 14251.9149941332. The cubic root of 203117081 is about 587.8260327665.

Adding to 203117081 its reverse (180711302), we get a palindrome (383828383).

The spelling of 203117081 in words is "two hundred three million, one hundred seventeen thousand, eighty-one".