109999643 has 4 divisors (see below), whose sum is σ = 118461168. Its totient is φ = 101538120.

The previous prime is 109999627. The next prime is 109999657. The reversal of 109999643 is 346999901.

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: 346999901 = 67 ⋅5179103.

It is a cyclic number.

It is not a de Polignac number, because 109999643 - 2⁴ = 109999627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109999591 and 109999600.

It is not an unprimeable number, because it can be changed into a prime (109999663) 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, 4230743 + ... + 4230768.

It is an arithmetic number, because the mean of its divisors is an integer number (29615292).

Almost surely, 2^109999643 is an apocalyptic number.

109999643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

109999643 is a deficient number, since it is larger than the sum of its proper divisors (8461525).

109999643 is an equidigital number, since it uses as much as digits as its factorization.

109999643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8461524.

The product of its (nonzero) digits is 472392, while the sum is 50.

The square root of 109999643 is about 10488.0714623805. The cubic root of 109999643 is about 479.1414673612.

The spelling of 109999643 in words is "one hundred nine million, nine hundred ninety-nine thousand, six hundred forty-three".