203113100191 has 4 divisors (see below), whose sum is σ = 215060929632. Its totient is φ = 191165270752.

The previous prime is 203113100189. The next prime is 203113100231. The reversal of 203113100191 is 191001311302.

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 203113100191 - 2¹ = 203113100189 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 (203113160191) 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, 5973914695 + ... + 5973914728.

It is an arithmetic number, because the mean of its divisors is an integer number (53765232408).

Almost surely, 2^203113100191 is an apocalyptic number.

203113100191 is a deficient number, since it is larger than the sum of its proper divisors (11947829441).

203113100191 is a wasteful number, since it uses less digits than its factorization.

203113100191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11947829440.

The product of its (nonzero) digits is 162, while the sum is 22.

Adding to 203113100191 its reverse (191001311302), we get a palindrome (394114411493).

The spelling of 203113100191 in words is "two hundred three billion, one hundred thirteen million, one hundred thousand, one hundred ninety-one".