2155532111 has 4 divisors (see below), whose sum is σ = 2155666512. Its totient is φ = 2155397712.

The previous prime is 2155532089. The next prime is 2155532131. The reversal of 2155532111 is 1112355512.

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 2155532111 - 2⁶ = 2155532047 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 (2155532131) 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 3 ways as a sum of consecutive naturals, for example, 39275 + ... + 76508.

It is an arithmetic number, because the mean of its divisors is an integer number (538916628).

Almost surely, 2^2155532111 is an apocalyptic number.

2155532111 is a deficient number, since it is larger than the sum of its proper divisors (134401).

2155532111 is a wasteful number, since it uses less digits than its factorization.

2155532111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134400.

The product of its digits is 1500, while the sum is 26.

The square root of 2155532111 is about 46427.7084401115. The cubic root of 2155532111 is about 1291.7689233195.

Adding to 2155532111 its reverse (1112355512), we get a palindrome (3267887623).

The spelling of 2155532111 in words is "two billion, one hundred fifty-five million, five hundred thirty-two thousand, one hundred eleven".