109979 has 4 divisors (see below), whose sum is σ = 111600. Its totient is φ = 108360.

The previous prime is 109961. The next prime is 109987. The reversal of 109979 is 979901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979901 = 13 ⋅75377.

It is a cyclic number.

It is not a de Polignac number, because 109979 - 2¹² = 105883 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (109919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704 + ... + 845.

It is an arithmetic number, because the mean of its divisors is an integer number (27900).

2¹⁰⁹⁹⁷⁹ is an apocalyptic number.

109979 is a deficient number, since it is larger than the sum of its proper divisors (1621).

109979 is an equidigital number, since it uses as much as digits as its factorization.

109979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 109979 is about 331.6308188332. The cubic root of 109979 is about 47.9111492912.

The spelling of 109979 in words is "one hundred nine thousand, nine hundred seventy-nine".