102508809 has 12 divisors (see below), whose sum is σ = 148001616. Its totient is φ = 63082032.

The previous prime is 102508799. The next prime is 102508811. The reversal of 102508809 is 908805201.

It is a happy number.

It is not a de Polignac number, because 102508809 - 2⁹ = 102508297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102508809.

It is not an unprimeable number, because it can be changed into a prime (102508829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100587 + ... + 101600.

It is an arithmetic number, because the mean of its divisors is an integer number (12333468).

Almost surely, 2^102508809 is an apocalyptic number.

It is an amenable number.

102508809 is a deficient number, since it is larger than the sum of its proper divisors (45492807).

102508809 is a wasteful number, since it uses less digits than its factorization.

102508809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202216 (or 202203 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 102508809 is about 10124.6634018124. The cubic root of 102508809 is about 468.0084875004.

The spelling of 102508809 in words is "one hundred two million, five hundred eight thousand, eight hundred nine".