109819 has 2 divisors, whose sum is σ = 109820. Its totient is φ = 109818.

The previous prime is 109807. The next prime is 109829. The reversal of 109819 is 918901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109819 - 2¹³ = 101627 is a prime.

It is a super-2 number, since 2×109819² = 24120425522, which contains 22 as substring.

It is a Chen prime.

109819 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (109829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54909 + 54910.

It is an arithmetic number, because the mean of its divisors is an integer number (54910).

2¹⁰⁹⁸¹⁹ is an apocalyptic number.

109819 is a deficient number, since it is larger than the sum of its proper divisors (1).

109819 is an equidigital number, since it uses as much as digits as its factorization.

109819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 109819 is about 331.3894989284. The cubic root of 109819 is about 47.8879039312.

The spelling of 109819 in words is "one hundred nine thousand, eight hundred nineteen".