203321161 has 4 divisors (see below), whose sum is σ = 203412352. Its totient is φ = 203229972.

The previous prime is 203321143. The next prime is 203321177. The reversal of 203321161 is 161123302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 203321161 - 2¹³ = 203312969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203321141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42165 + ... + 46738.

It is an arithmetic number, because the mean of its divisors is an integer number (50853088).

Almost surely, 2^203321161 is an apocalyptic number.

It is an amenable number.

203321161 is a deficient number, since it is larger than the sum of its proper divisors (91191).

203321161 is an equidigital number, since it uses as much as digits as its factorization.

203321161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91190.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 203321161 is about 14259.0729362045. The cubic root of 203321161 is about 588.0228377836.

Adding to 203321161 its reverse (161123302), we get a palindrome (364444463).

The spelling of 203321161 in words is "two hundred three million, three hundred twenty-one thousand, one hundred sixty-one".