109991365 has 16 divisors (see below), whose sum is σ = 144317376. Its totient is φ = 79811200.

The previous prime is 109991341. The next prime is 109991381. The reversal of 109991365 is 563199901.

It is not a de Polignac number, because 109991365 - 2⁷ = 109991237 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 15 ways as a sum of consecutive naturals, for example, 24969 + ... + 29041.

It is an arithmetic number, because the mean of its divisors is an integer number (9019836).

Almost surely, 2^109991365 is an apocalyptic number.

It is an amenable number.

109991365 is a deficient number, since it is larger than the sum of its proper divisors (34326011).

109991365 is a wasteful number, since it uses less digits than its factorization.

109991365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4580.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 109991365 is about 10487.6768161495. The cubic root of 109991365 is about 479.1294478296.

The spelling of 109991365 in words is "one hundred nine million, nine hundred ninety-one thousand, three hundred sixty-five".