109921605 has 16 divisors (see below), whose sum is σ = 176895360. Its totient is φ = 58284608.

The previous prime is 109921601. The next prime is 109921667. The reversal of 109921605 is 506129901.

It is a cyclic number.

It is not a de Polignac number, because 109921605 - 2² = 109921601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109921601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18585 + ... + 23774.

It is an arithmetic number, because the mean of its divisors is an integer number (11055960).

Almost surely, 2^109921605 is an apocalyptic number.

109921605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109921605 is a deficient number, since it is larger than the sum of its proper divisors (66973755).

109921605 is a wasteful number, since it uses less digits than its factorization.

109921605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42540.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 109921605 is about 10484.3504805973. The cubic root of 109921605 is about 479.0281333947.

The spelling of 109921605 in words is "one hundred nine million, nine hundred twenty-one thousand, six hundred five".