1201111101 has 12 divisors (see below), whose sum is σ = 1739594428. Its totient is φ = 798591744.

The previous prime is 1201111091. The next prime is 1201111117. The reversal of 1201111101 is 1011111021.

It can be written as a sum of positive squares in 2 ways, for example, as 628705476 + 572405625 = 25074^2 + 23925^2 .

It is not a de Polignac number, because 1201111101 - 2¹⁹ = 1200586813 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 Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201111141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175540 + ... + 182253.

Almost surely, 2^1201111101 is an apocalyptic number.

It is an amenable number.

1201111101 is a deficient number, since it is larger than the sum of its proper divisors (538483327).

1201111101 is a wasteful number, since it uses less digits than its factorization.

1201111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358172 (or 358169 counting only the distinct ones).

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

The square root of 1201111101 is about 34657.0498023129. The cubic root of 1201111101 is about 1062.9864460630.

Adding to 1201111101 its reverse (1011111021), we get a palindrome (2212222122).

It can be divided in two parts, 1 and 201111101, that added together give a palindrome (201111102).

The spelling of 1201111101 in words is "one billion, two hundred one million, one hundred eleven thousand, one hundred one".