1201112001 has 6 divisors (see below), whose sum is σ = 1734939570. Its totient is φ = 800741328.

The previous prime is 1201111993. The next prime is 1201112027. The reversal of 1201112001 is 1002111021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1152670401 + 48441600 = 33951^2 + 6960^2 .

It is not a de Polignac number, because 1201112001 - 2³ = 1201111993 is a prime.

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: 133456889 = 1201112001 / (1 + 2 + 0 + 1 + 1 + 1 + 2 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1201112051) 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, 66728436 + ... + 66728453.

It is an arithmetic number, because the mean of its divisors is an integer number (289156595).

Almost surely, 2^1201112001 is an apocalyptic number.

It is an amenable number.

1201112001 is a deficient number, since it is larger than the sum of its proper divisors (533827569).

1201112001 is a wasteful number, since it uses less digits than its factorization.

1201112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133456895 (or 133456892 counting only the distinct ones).

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

The square root of 1201112001 is about 34657.0627866817. The cubic root of 1201112001 is about 1062.9867115637.

Adding to 1201112001 its reverse (1002111021), we get a palindrome (2203223022).

The spelling of 1201112001 in words is "one billion, two hundred one million, one hundred twelve thousand, one".