201111110001 has 6 divisors (see below), whose sum is σ = 290493825570. Its totient is φ = 134074073328.

The previous prime is 201111109999. The next prime is 201111110069. The reversal of 201111110001 is 100011111102.

It can be written as a sum of positive squares in only one way, i.e., 167052038400 + 34059071601 = 408720^2 + 184551^2 .

It is not a de Polignac number, because 201111110001 - 2¹ = 201111109999 is a prime.

It is a super-3 number, since 3×201111110001³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 22345678889 = 201111110001 / (2 + 0 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (201111117001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11172839436 + ... + 11172839453.

It is an arithmetic number, because the mean of its divisors is an integer number (48415637595).

Almost surely, 2^201111110001 is an apocalyptic number.

It is an amenable number.

201111110001 is a deficient number, since it is larger than the sum of its proper divisors (89382715569).

201111110001 is a wasteful number, since it uses less digits than its factorization.

201111110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22345678895 (or 22345678892 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 201111110001 its reverse (100011111102), we get a palindrome (301122221103).

The spelling of 201111110001 in words is "two hundred one billion, one hundred eleven million, one hundred ten thousand, one".