1012111111 has 4 divisors (see below), whose sum is σ = 1104121224. Its totient is φ = 920101000.

The previous prime is 1012111091. The next prime is 1012111123. The reversal of 1012111111 is 1111112101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1012111111 - 2¹⁵ = 1012078343 is a prime.

It is a Duffinian number.

1012111111 is a modest number, since divided by 11111 gives 10121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012111151) 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, 46005040 + ... + 46005061.

It is an arithmetic number, because the mean of its divisors is an integer number (276030306).

Almost surely, 2^1012111111 is an apocalyptic number.

1012111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1012111111 is a deficient number, since it is larger than the sum of its proper divisors (92010113).

1012111111 is an equidigital number, since it uses as much as digits as its factorization.

1012111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92010112.

The product of its (nonzero) digits is 2, while the sum is 10.

The square root of 1012111111 is about 31813.6937654212. The cubic root of 1012111111 is about 1004.0208481118.

Adding to 1012111111 its reverse (1111112101), we get a palindrome (2123223212).

It can be divided in two parts, 10 and 12111111, that added together give a palindrome (12111121).

The spelling of 1012111111 in words is "one billion, twelve million, one hundred eleven thousand, one hundred eleven".