102648509 has 2 divisors, whose sum is σ = 102648510. Its totient is φ = 102648508.

The previous prime is 102648473. The next prime is 102648521. The reversal of 102648509 is 905846201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63648484 + 39000025 = 7978^2 + 6245^2 .

It is a cyclic number.

It is not a de Polignac number, because 102648509 - 2¹² = 102644413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102648589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51324254 + 51324255.

It is an arithmetic number, because the mean of its divisors is an integer number (51324255).

Almost surely, 2^102648509 is an apocalyptic number.

It is an amenable number.

102648509 is a deficient number, since it is larger than the sum of its proper divisors (1).

102648509 is an equidigital number, since it uses as much as digits as its factorization.

102648509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 102648509 is about 10131.5600476926. The cubic root of 102648509 is about 468.2209931647.

The spelling of 102648509 in words is "one hundred two million, six hundred forty-eight thousand, five hundred nine".