2165903 has 2 divisors, whose sum is σ = 2165904. Its totient is φ = 2165902.

The previous prime is 2165897. The next prime is 2165921. The reversal of 2165903 is 3095612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2165903 is a prime.

It is a super-2 number, since 2×2165903² = 9382271610818, which contains 22 as substring.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082951 + 1082952.

It is an arithmetic number, because the mean of its divisors is an integer number (1082952).

2^2165903 is an apocalyptic number.

2165903 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165903 is an equidigital number, since it uses as much as digits as its factorization.

2165903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 2165903 is about 1471.7007168579. The cubic root of 2165903 is about 129.3837301086.

The spelling of 2165903 in words is "two million, one hundred sixty-five thousand, nine hundred three".