109517845 has 4 divisors (see below), whose sum is σ = 131421420. Its totient is φ = 87614272.

The previous prime is 109517839. The next prime is 109517879. The reversal of 109517845 is 548715901.

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: 548715901 = 131 ⋅4188671.

It can be written as a sum of positive squares in 2 ways, for example, as 79673476 + 29844369 = 8926^2 + 5463^2 .

It is a cyclic number.

It is not a de Polignac number, because 109517845 - 2¹⁷ = 109386773 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 109517798 and 109517807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10951780 + ... + 10951789.

It is an arithmetic number, because the mean of its divisors is an integer number (32855355).

Almost surely, 2^109517845 is an apocalyptic number.

It is an amenable number.

109517845 is a deficient number, since it is larger than the sum of its proper divisors (21903575).

109517845 is an equidigital number, since it uses as much as digits as its factorization.

109517845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21903574.

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 109517845 is about 10465.0774005738. The cubic root of 109517845 is about 478.4408976238.

The spelling of 109517845 in words is "one hundred nine million, five hundred seventeen thousand, eight hundred forty-five".