1201200111 has 20 divisors (see below), whose sum is σ = 1811819152. Its totient is φ = 793019808.

The previous prime is 1201200107. The next prime is 1201200113. The reversal of 1201200111 is 1110021021.

It is a happy number.

It is not a de Polignac number, because 1201200111 - 2² = 1201200107 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 = 1201200093 and 1201200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201200113) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 63646 + ... + 80331.

Almost surely, 2^1201200111 is an apocalyptic number.

1201200111 is a deficient number, since it is larger than the sum of its proper divisors (610619041).

1201200111 is a wasteful number, since it uses less digits than its factorization.

1201200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144092 (or 144083 counting only the distinct ones).

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

The square root of 1201200111 is about 34658.3339328364. Note that the first 3 decimals coincide. The cubic root of 1201200111 is about 1063.0127034415.

Adding to 1201200111 its reverse (1110021021), we get a palindrome (2311221132).

The spelling of 1201200111 in words is "one billion, two hundred one million, two hundred thousand, one hundred eleven".