102819 has 4 divisors (see below), whose sum is σ = 137096. Its totient is φ = 68544.

The previous prime is 102811. The next prime is 102829. The reversal of 102819 is 918201.

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

It is not a de Polignac number, because 102819 - 2³ = 102811 is a prime.

It is a super-2 number, since 2×102819² = 21143493522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102795 and 102804.

It is not an unprimeable number, because it can be changed into a prime (102811) 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, 17134 + ... + 17139.

It is an arithmetic number, because the mean of its divisors is an integer number (34274).

2¹⁰²⁸¹⁹ is an apocalyptic number.

102819 is a deficient number, since it is larger than the sum of its proper divisors (34277).

102819 is an equidigital number, since it uses as much as digits as its factorization.

102819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34276.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 102819 is about 320.6540191546. The cubic root of 102819 is about 46.8480075708.

It can be divided in two parts, 10281 and 9, that multiplied together give a palindrome (92529).

The spelling of 102819 in words is "one hundred two thousand, eight hundred nineteen".