2165387231 has 32 divisors (see below), whose sum is σ = 2715648000. Its totient is φ = 1684787040.

The previous prime is 2165387209. The next prime is 2165387251. The reversal of 2165387231 is 1327835612.

2165387231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2165387231 - 2¹⁰ = 2165386207 is a prime.

It is a super-2 number, since 2×2165387231² = 9377803720355694722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165387201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 422120 + ... + 427218.

It is an arithmetic number, because the mean of its divisors is an integer number (84864000).

Almost surely, 2^2165387231 is an apocalyptic number.

2165387231 is a deficient number, since it is larger than the sum of its proper divisors (550260769).

2165387231 is a wasteful number, since it uses less digits than its factorization.

2165387231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259.

The product of its digits is 60480, while the sum is 38.

The square root of 2165387231 is about 46533.7214394035. The cubic root of 2165387231 is about 1293.7345919392.

The spelling of 2165387231 in words is "two billion, one hundred sixty-five million, three hundred eighty-seven thousand, two hundred thirty-one".