203241311391 has 4 divisors (see below), whose sum is σ = 270988415192. Its totient is φ = 135494207592.

The previous prime is 203241311389. The next prime is 203241311419. The reversal of 203241311391 is 193113142302.

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

It is not a de Polignac number, because 203241311391 - 2¹ = 203241311389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203241313391) 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, 33873551896 + ... + 33873551901.

It is an arithmetic number, because the mean of its divisors is an integer number (67747103798).

Almost surely, 2^203241311391 is an apocalyptic number.

203241311391 is a deficient number, since it is larger than the sum of its proper divisors (67747103801).

203241311391 is an equidigital number, since it uses as much as digits as its factorization.

203241311391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67747103800.

The product of its (nonzero) digits is 3888, while the sum is 30.

Adding to 203241311391 its reverse (193113142302), we get a palindrome (396354453693).

The spelling of 203241311391 in words is "two hundred three billion, two hundred forty-one million, three hundred eleven thousand, three hundred ninety-one".