1201011111 has 32 divisors (see below), whose sum is σ = 1837840320. Its totient is φ = 774738432.

The previous prime is 1201011107. The next prime is 1201011131. The reversal of 1201011111 is 1111101021.

It is not a de Polignac number, because 1201011111 - 2² = 1201011107 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 = 1201011093 and 1201011102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201011131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98715 + ... + 110211.

It is an arithmetic number, because the mean of its divisors is an integer number (57432510).

Almost surely, 2^1201011111 is an apocalyptic number.

1201011111 is a deficient number, since it is larger than the sum of its proper divisors (636829209).

1201011111 is a wasteful number, since it uses less digits than its factorization.

1201011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11632 (or 11626 counting only the distinct ones).

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

The square root of 1201011111 is about 34655.6072086466. The cubic root of 1201011111 is about 1062.9569481078.

Adding to 1201011111 its reverse (1111101021), we get a palindrome (2312112132).

The spelling of 1201011111 in words is "one billion, two hundred one million, eleven thousand, one hundred eleven".