203201031091 has 4 divisors (see below), whose sum is σ = 204222142000. Its totient is φ = 202179920184.

The previous prime is 203201031073. The next prime is 203201031119. The reversal of 203201031091 is 190130102302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 203201031091 - 2⁹ = 203201030579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203201031191) 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, 510555156 + ... + 510555553.

It is an arithmetic number, because the mean of its divisors is an integer number (51055535500).

Almost surely, 2^203201031091 is an apocalyptic number.

203201031091 is a deficient number, since it is larger than the sum of its proper divisors (1021110909).

203201031091 is a wasteful number, since it uses less digits than its factorization.

203201031091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021110908.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 203201031091 its reverse (190130102302), we get a palindrome (393331133393).

The spelling of 203201031091 in words is "two hundred three billion, two hundred one million, thirty-one thousand, ninety-one".