102808081 has 4 divisors (see below), whose sum is σ = 102860212. Its totient is φ = 102755952.

The previous prime is 102808049. The next prime is 102808087. The reversal of 102808081 is 180808201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70829056 + 31979025 = 8416^2 + 5655^2 .

It is a cyclic number.

It is not a de Polignac number, because 102808081 - 2⁵ = 102808049 is a prime.

It is a super-2 number, since 2×102808081² = 21139003037805122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102808087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22986 + ... + 27091.

It is an arithmetic number, because the mean of its divisors is an integer number (25715053).

Almost surely, 2^102808081 is an apocalyptic number.

It is an amenable number.

102808081 is a deficient number, since it is larger than the sum of its proper divisors (52131).

102808081 is an equidigital number, since it uses as much as digits as its factorization.

102808081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52130.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 102808081 is about 10139.4319860631. The cubic root of 102808081 is about 468.4634915002.

The spelling of 102808081 in words is "one hundred two million, eight hundred eight thousand, eighty-one".