2155918311 has 12 divisors (see below), whose sum is σ = 3115436688. Its totient is φ = 1436663904.

The previous prime is 2155918309. The next prime is 2155918313. The reversal of 2155918311 is 1138195512.

2155918311 is a `hidden beast` number, since 21 + 559 + 1 + 83 + 1 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2155918309) and next prime (2155918313).

It is not a de Polignac number, because 2155918311 - 2¹ = 2155918309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155918313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28515 + ... + 71588.

It is an arithmetic number, because the mean of its divisors is an integer number (259619724).

Almost surely, 2^2155918311 is an apocalyptic number.

2155918311 is a deficient number, since it is larger than the sum of its proper divisors (959518377).

2155918311 is a wasteful number, since it uses less digits than its factorization.

2155918311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102502 (or 102499 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 2155918311 is about 46431.8674080636. The cubic root of 2155918311 is about 1291.8460661224.

The spelling of 2155918311 in words is "two billion, one hundred fifty-five million, nine hundred eighteen thousand, three hundred eleven".