203512120091 has 16 divisors (see below), whose sum is σ = 232974636480. Its totient is φ = 174147141120.

The previous prime is 203512120079. The next prime is 203512120157. The reversal of 203512120091 is 190021215302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 203512120091 - 2⁶ = 203512120027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203512120091.

It is not an unprimeable number, because it can be changed into a prime (203512120061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15719681 + ... + 15732621.

It is an arithmetic number, because the mean of its divisors is an integer number (14560914780).

Almost surely, 2^203512120091 is an apocalyptic number.

203512120091 is a deficient number, since it is larger than the sum of its proper divisors (29462516389).

203512120091 is a wasteful number, since it uses less digits than its factorization.

203512120091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16534.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 203512120091 its reverse (190021215302), we get a palindrome (393533335393).

The spelling of 203512120091 in words is "two hundred three billion, five hundred twelve million, one hundred twenty thousand, ninety-one".