102019609 has 2 divisors, whose sum is σ = 102019610. Its totient is φ = 102019608.

The previous prime is 102019591. The next prime is 102019661. The reversal of 102019609 is 906910201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80192025 + 21827584 = 8955^2 + 4672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102019609 is a prime.

It is a Chen prime.

It is equal to p_5871043 and since 102019609 and 5871043 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (102019679) 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, 51009804 + 51009805.

It is an arithmetic number, because the mean of its divisors is an integer number (51009805).

Almost surely, 2^102019609 is an apocalyptic number.

It is an amenable number.

102019609 is a deficient number, since it is larger than the sum of its proper divisors (1).

102019609 is an equidigital number, since it uses as much as digits as its factorization.

102019609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 102019609 is about 10100.4756818677. The cubic root of 102019609 is about 467.2628119935.

The spelling of 102019609 in words is "one hundred two million, nineteen thousand, six hundred nine".