102245809 has 2 divisors, whose sum is σ = 102245810. Its totient is φ = 102245808.

The previous prime is 102245807. The next prime is 102245839. The reversal of 102245809 is 908542201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69355584 + 32890225 = 8328^2 + 5735^2 .

It is a cyclic number.

It is not a de Polignac number, because 102245809 - 2¹ = 102245807 is a prime.

Together with 102245807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (102245807) 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, 51122904 + 51122905.

It is an arithmetic number, because the mean of its divisors is an integer number (51122905).

Almost surely, 2^102245809 is an apocalyptic number.

It is an amenable number.

102245809 is a deficient number, since it is larger than the sum of its proper divisors (1).

102245809 is an equidigital number, since it uses as much as digits as its factorization.

102245809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 102245809 is about 10111.6669743421. Note that the first 3 decimals coincide. The cubic root of 102245809 is about 467.6078986846.

The spelling of 102245809 in words is "one hundred two million, two hundred forty-five thousand, eight hundred nine".