201201111 has 8 divisors (see below), whose sum is σ = 298075760. Its totient is φ = 134134056.

The previous prime is 201201109. The next prime is 201201113. The reversal of 201201111 is 111102102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (201201109) and next prime (201201113).

It is not a de Polignac number, because 201201111 - 2¹ = 201201109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201201093 and 201201102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201201113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3725920 + ... + 3725973.

It is an arithmetic number, because the mean of its divisors is an integer number (37259470).

Almost surely, 2^201201111 is an apocalyptic number.

201201111 is a deficient number, since it is larger than the sum of its proper divisors (96874649).

201201111 is an equidigital number, since it uses as much as digits as its factorization.

201201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7451902 (or 7451896 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 201201111 is about 14184.5377436136. The cubic root of 201201111 is about 585.9719018393.

Adding to 201201111 its reverse (111102102), we get a palindrome (312303213).

Subtracting from 201201111 its reverse (111102102), we obtain a palindrome (90099009).

The spelling of 201201111 in words is "two hundred one million, two hundred one thousand, one hundred eleven".