1002012111 has 6 divisors (see below), whose sum is σ = 1447350840. Its totient is φ = 668008068.

The previous prime is 1002012071. The next prime is 1002012131. The reversal of 1002012111 is 1112102001.

It is a happy number.

It is not a de Polignac number, because 1002012111 - 2¹⁵ = 1001979343 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: 111334679 = 1002012111 / (1 + 0 + 0 + 2 + 0 + 1 + 2 + 1 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1002012093 and 1002012102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002012131) 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, 55667331 + ... + 55667348.

It is an arithmetic number, because the mean of its divisors is an integer number (241225140).

Almost surely, 2^1002012111 is an apocalyptic number.

1002012111 is a deficient number, since it is larger than the sum of its proper divisors (445338729).

1002012111 is a wasteful number, since it uses less digits than its factorization.

1002012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111334685 (or 111334682 counting only the distinct ones).

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

The square root of 1002012111 is about 31654.5748826295. The cubic root of 1002012111 is about 1000.6702543254.

Adding to 1002012111 its reverse (1112102001), we get a palindrome (2114114112).

The spelling of 1002012111 in words is "one billion, two million, twelve thousand, one hundred eleven".