2100869 has 2 divisors, whose sum is σ = 2100870. Its totient is φ = 2100868.

The previous prime is 2100859. The next prime is 2100893. The reversal of 2100869 is 9680012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 879844 = 1105^2 + 938^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100869 is a prime.

It is a super-2 number, since 2×2100869² = 8827301110322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100859) 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, 1050434 + 1050435.

It is an arithmetic number, because the mean of its divisors is an integer number (1050435).

2^2100869 is an apocalyptic number.

It is an amenable number.

2100869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100869 is an equidigital number, since it uses as much as digits as its factorization.

2100869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 2100869 is about 1449.4374770924. The cubic root of 2100869 is about 128.0755779246.

The spelling of 2100869 in words is "two million, one hundred thousand, eight hundred sixty-nine".