102808281 has 4 divisors (see below), whose sum is σ = 137077712. Its totient is φ = 68538852.

The previous prime is 102808271. The next prime is 102808283. The reversal of 102808281 is 182808201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 102808281 - 2¹¹ = 102806233 is a prime.

It is a super-2 number, since 2×102808281² = 21139085284349922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102808283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17134711 + ... + 17134716.

It is an arithmetic number, because the mean of its divisors is an integer number (34269428).

Almost surely, 2^102808281 is an apocalyptic number.

It is an amenable number.

102808281 is a deficient number, since it is larger than the sum of its proper divisors (34269431).

102808281 is an equidigital number, since it uses as much as digits as its factorization.

102808281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34269430.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 102808281 is about 10139.4418485437. The cubic root of 102808281 is about 468.4637952786.

The spelling of 102808281 in words is "one hundred two million, eight hundred eight thousand, two hundred eighty-one".