109599991 has 8 divisors (see below), whose sum is σ = 117025920. Its totient is φ = 102395832.

The previous prime is 109599979. The next prime is 109600021. The reversal of 109599991 is 199995901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109599991 - 2²⁵ = 76045559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109599691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54421 + ... + 56398.

It is an arithmetic number, because the mean of its divisors is an integer number (14628240).

Almost surely, 2^109599991 is an apocalyptic number.

109599991 is a deficient number, since it is larger than the sum of its proper divisors (7425929).

109599991 is a wasteful number, since it uses less digits than its factorization.

109599991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110885.

The product of its (nonzero) digits is 295245, while the sum is 52.

The square root of 109599991 is about 10469.0014328015. The cubic root of 109599991 is about 478.5604890433.

The spelling of 109599991 in words is "one hundred nine million, five hundred ninety-nine thousand, nine hundred ninety-one".