1201111011 has 40 divisors (see below), whose sum is σ = 1911645120. Its totient is φ = 749377008.

The previous prime is 1201111007. The next prime is 1201111019. The reversal of 1201111011 is 1101111021.

It is not a de Polignac number, because 1201111011 - 2² = 1201111007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1201110984 and 1201111002.

It is not an unprimeable number, because it can be changed into a prime (1201111019) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 123036 + ... + 132438.

It is an arithmetic number, because the mean of its divisors is an integer number (47791128).

Almost surely, 2^1201111011 is an apocalyptic number.

1201111011 is a deficient number, since it is larger than the sum of its proper divisors (710534109).

1201111011 is an equidigital number, since it uses as much as digits as its factorization.

1201111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9517 (or 9508 counting only the distinct ones).

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

The square root of 1201111011 is about 34657.0485038758. The cubic root of 1201111011 is about 1062.9864195129.

Adding to 1201111011 its reverse (1101111021), we get a palindrome (2302222032).

The spelling of 1201111011 in words is "one billion, two hundred one million, one hundred eleven thousand, eleven".