2165440031 has 2 divisors, whose sum is σ = 2165440032. Its totient is φ = 2165440030.

The previous prime is 2165440009. The next prime is 2165440049. The reversal of 2165440031 is 1300445612.

2165440031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2165440031 - 2²² = 2161245727 is a prime.

It is a super-2 number, since 2×2165440031² = 9378261055714561922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165440091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082720015 + 1082720016.

It is an arithmetic number, because the mean of its divisors is an integer number (1082720016).

Almost surely, 2^2165440031 is an apocalyptic number.

2165440031 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165440031 is an equidigital number, since it uses as much as digits as its factorization.

2165440031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 2165440031 is about 46534.2887664569. The cubic root of 2165440031 is about 1293.7451071688.

Adding to 2165440031 its reverse (1300445612), we get a palindrome (3465885643).

The spelling of 2165440031 in words is "two billion, one hundred sixty-five million, four hundred forty thousand, thirty-one".