2165055331 has 4 divisors (see below), whose sum is σ = 2165187232. Its totient is φ = 2164923432.

The previous prime is 2165055317. The next prime is 2165055359. The reversal of 2165055331 is 1335505612.

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 2165055331 - 2⁹ = 2165054819 is a prime.

It is a super-2 number, since 2×2165055331² = 9374929172583039122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165055293 and 2165055302.

It is not an unprimeable number, because it can be changed into a prime (2165055311) 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 3 ways as a sum of consecutive naturals, for example, 37131 + ... + 75556.

It is an arithmetic number, because the mean of its divisors is an integer number (541296808).

Almost surely, 2^2165055331 is an apocalyptic number.

2165055331 is a deficient number, since it is larger than the sum of its proper divisors (131901).

2165055331 is a wasteful number, since it uses less digits than its factorization.

2165055331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131900.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 2165055331 is about 46530.1550717382. The cubic root of 2165055331 is about 1293.6684894511.

The spelling of 2165055331 in words is "two billion, one hundred sixty-five million, fifty-five thousand, three hundred thirty-one".