2161903 has 2 divisors, whose sum is σ = 2161904. Its totient is φ = 2161902.

The previous prime is 2161897. The next prime is 2161919. The reversal of 2161903 is 3091612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161903 - 2⁵ = 2161871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080951 + 1080952.

It is an arithmetic number, because the mean of its divisors is an integer number (1080952).

2^2161903 is an apocalyptic number.

2161903 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161903 is an equidigital number, since it uses as much as digits as its factorization.

2161903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2161903 is about 1470.3411168841. The cubic root of 2161903 is about 129.3040321962.

The spelling of 2161903 in words is "two million, one hundred sixty-one thousand, nine hundred three".