109517971 has 4 divisors (see below), whose sum is σ = 110748600. Its totient is φ = 108287344.

The previous prime is 109517959. The next prime is 109517977. The reversal of 109517971 is 179715901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179715901 = 673 ⋅267037.

It is a cyclic number.

It is not a de Polignac number, because 109517971 - 2¹⁷ = 109386899 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 Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109517977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615181 + ... + 615358.

It is an arithmetic number, because the mean of its divisors is an integer number (27687150).

Almost surely, 2^109517971 is an apocalyptic number.

109517971 is a deficient number, since it is larger than the sum of its proper divisors (1230629).

109517971 is an equidigital number, since it uses as much as digits as its factorization.

109517971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230628.

The product of its (nonzero) digits is 19845, while the sum is 40.

The square root of 109517971 is about 10465.0834205944. The cubic root of 109517971 is about 478.4410811054.

The spelling of 109517971 in words is "one hundred nine million, five hundred seventeen thousand, nine hundred seventy-one".