2155000111 has 8 divisors (see below), whose sum is σ = 2453122944. Its totient is φ = 1873912920.

The previous prime is 2155000091. The next prime is 2155000129. The reversal of 2155000111 is 1110005512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155000111 - 2⁵ = 2155000079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155000151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4258641 + ... + 4259146.

It is an arithmetic number, because the mean of its divisors is an integer number (306640368).

Almost surely, 2^2155000111 is an apocalyptic number.

2155000111 is a deficient number, since it is larger than the sum of its proper divisors (298122833).

2155000111 is a wasteful number, since it uses less digits than its factorization.

2155000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517821.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 2155000111 is about 46421.9787492950. The cubic root of 2155000111 is about 1291.6626421204.

Adding to 2155000111 its reverse (1110005512), we get a palindrome (3265005623).

The spelling of 2155000111 in words is "two billion, one hundred fifty-five million, one hundred eleven", and thus it is an aban number.