1201100111 has 4 divisors (see below), whose sum is σ = 1221457800. Its totient is φ = 1180742424.

The previous prime is 1201100107. The next prime is 1201100137. The reversal of 1201100111 is 1110011021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1110011021 = 7 ⋅158573003.

It is a cyclic number.

It is not a de Polignac number, because 1201100111 - 2² = 1201100107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201100101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10178756 + ... + 10178873.

It is an arithmetic number, because the mean of its divisors is an integer number (305364450).

Almost surely, 2^1201100111 is an apocalyptic number.

1201100111 is a deficient number, since it is larger than the sum of its proper divisors (20357689).

1201100111 is an equidigital number, since it uses as much as digits as its factorization.

1201100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20357688.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1201100111 is about 34656.8912483506. The cubic root of 1201100111 is about 1062.9832039936.

Adding to 1201100111 its reverse (1110011021), we get a palindrome (2311111132).

The spelling of 1201100111 in words is "one billion, two hundred one million, one hundred thousand, one hundred eleven".