1020109 has 2 divisors, whose sum is σ = 1020110. Its totient is φ = 1020108.

The previous prime is 1020101. The next prime is 1020113. The reversal of 1020109 is 9010201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020100 + 9 = 1010^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020109 - 2³ = 1020101 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510054 + 510055.

It is an arithmetic number, because the mean of its divisors is an integer number (510055).

2^1020109 is an apocalyptic number.

It is an amenable number.

1020109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020109 is an equidigital number, since it uses as much as digits as its factorization.

1020109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1020109 is about 1010.0044554357. The cubic root of 1020109 is about 100.6658565105.

The spelling of 1020109 in words is "one million, twenty thousand, one hundred nine".