109991765 has 8 divisors (see below), whose sum is σ = 142143288. Its totient is φ = 81224640.

The previous prime is 109991759. The next prime is 109991789. The reversal of 109991765 is 567199901.

It can be written as a sum of positive squares in 4 ways, for example, as 4990756 + 105001009 = 2234^2 + 10247^2 .

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

It is not a de Polignac number, because 109991765 - 2⁶ = 109991701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846026 + ... + 846155.

It is an arithmetic number, because the mean of its divisors is an integer number (17767911).

Almost surely, 2^109991765 is an apocalyptic number.

It is an amenable number.

109991765 is a deficient number, since it is larger than the sum of its proper divisors (32151523).

109991765 is a wasteful number, since it uses less digits than its factorization.

109991765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692199.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 109991765 is about 10487.6958861325. The cubic root of 109991765 is about 479.1300286374.

The spelling of 109991765 in words is "one hundred nine million, nine hundred ninety-one thousand, seven hundred sixty-five".