102661309 has 2 divisors, whose sum is σ = 102661310. Its totient is φ = 102661308.

The previous prime is 102661297. The next prime is 102661319. The reversal of 102661309 is 903166201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69056100 + 33605209 = 8310^2 + 5797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102661309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102661319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51330654 + 51330655.

It is an arithmetic number, because the mean of its divisors is an integer number (51330655).

Almost surely, 2^102661309 is an apocalyptic number.

It is an amenable number.

102661309 is a deficient number, since it is larger than the sum of its proper divisors (1).

102661309 is an equidigital number, since it uses as much as digits as its factorization.

102661309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 102661309 is about 10132.1917174913. The cubic root of 102661309 is about 468.2404543326.

The spelling of 102661309 in words is "one hundred two million, six hundred sixty-one thousand, three hundred nine".