201111553 has 2 divisors, whose sum is σ = 201111554. Its totient is φ = 201111552.

The previous prime is 201111551. The next prime is 201111583. The reversal of 201111553 is 355111102.

201111553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191075329 + 10036224 = 13823^2 + 3168^2 .

It is a cyclic number.

It is not a de Polignac number, because 201111553 - 2¹ = 201111551 is a prime.

Together with 201111551, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 201111553.

It is not a weakly prime, because it can be changed into another prime (201111551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555776 + 100555777.

It is an arithmetic number, because the mean of its divisors is an integer number (100555777).

Almost surely, 2^201111553 is an apocalyptic number.

It is an amenable number.

201111553 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111553 is an equidigital number, since it uses as much as digits as its factorization.

201111553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 201111553 is about 14181.3805040271. The cubic root of 201111553 is about 585.8849469519.

Adding to 201111553 its reverse (355111102), we get a palindrome (556222655).

The spelling of 201111553 in words is "two hundred one million, one hundred eleven thousand, five hundred fifty-three".