2101789 has 2 divisors, whose sum is σ = 2101790. Its totient is φ = 2101788.

The previous prime is 2101751. The next prime is 2101807. The reversal of 2101789 is 9871012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1776889 + 324900 = 1333^2 + 570^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101789 - 2⁹ = 2101277 is a prime.

It is a Chen prime.

2101789 is a lucky number.

It is equal to p₁₅₅₉₃₅ and since 2101789 and 155935 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050894 + 1050895.

It is an arithmetic number, because the mean of its divisors is an integer number (1050895).

2^2101789 is an apocalyptic number.

It is an amenable number.

2101789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101789 is an equidigital number, since it uses as much as digits as its factorization.

2101789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 2101789 is about 1449.7548068553. The cubic root of 2101789 is about 128.0942705603.

The spelling of 2101789 in words is "two million, one hundred one thousand, seven hundred eighty-nine".