102304561 has 2 divisors, whose sum is σ = 102304562. Its totient is φ = 102304560.

The previous prime is 102304549. The next prime is 102304567. The reversal of 102304561 is 165403201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 35473936 = 8175^2 + 5956^2 .

It is an emirp because it is prime and its reverse (165403201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102304561 - 2²¹ = 100207409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102304567) 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, 51152280 + 51152281.

It is an arithmetic number, because the mean of its divisors is an integer number (51152281).

Almost surely, 2^102304561 is an apocalyptic number.

It is an amenable number.

102304561 is a deficient number, since it is larger than the sum of its proper divisors (1).

102304561 is an equidigital number, since it uses as much as digits as its factorization.

102304561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 102304561 is about 10114.5717160936. The cubic root of 102304561 is about 467.6974464098.

Adding to 102304561 its reverse (165403201), we get a palindrome (267707762).

The spelling of 102304561 in words is "one hundred two million, three hundred four thousand, five hundred sixty-one".