203138161 has 2 divisors, whose sum is σ = 203138162. Its totient is φ = 203138160.

The previous prime is 203138147. The next prime is 203138167. The reversal of 203138161 is 161831302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157979761 + 45158400 = 12569^2 + 6720^2 .

It is a cyclic number.

It is not a de Polignac number, because 203138161 - 2¹⁷ = 203007089 is a prime.

It is a super-2 number, since 2×203138161² = 82530224908923842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (203138167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101569080 + 101569081.

It is an arithmetic number, because the mean of its divisors is an integer number (101569081).

Almost surely, 2^203138161 is an apocalyptic number.

It is an amenable number.

203138161 is a deficient number, since it is larger than the sum of its proper divisors (1).

203138161 is an equidigital number, since it uses as much as digits as its factorization.

203138161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 203138161 is about 14252.6545246842. The cubic root of 203138161 is about 587.8463674163.

Adding to 203138161 its reverse (161831302), we get a palindrome (364969463).

The spelling of 203138161 in words is "two hundred three million, one hundred thirty-eight thousand, one hundred sixty-one".