2001111516 has 18 divisors (see below), whose sum is σ = 5058365312. Its totient is φ = 667037160.

The previous prime is 2001111493. The next prime is 2001111517. The reversal of 2001111516 is 6151111002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001111517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27793180 + ... + 27793251.

Almost surely, 2^2001111516 is an apocalyptic number.

It is an amenable number.

2001111516 is an abundant number, since it is smaller than the sum of its proper divisors (3057253796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001111516 is a wasteful number, since it uses less digits than its factorization.

2001111516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55586441 (or 55586436 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

The square root of 2001111516 is about 44733.7849505270. The cubic root of 2001111516 is about 1260.1544104038.

Adding to 2001111516 its reverse (6151111002), we get a palindrome (8152222518).

The spelling of 2001111516 in words is "two billion, one million, one hundred eleven thousand, five hundred sixteen".