109620865 has 4 divisors (see below), whose sum is σ = 131545044. Its totient is φ = 87696688.

The previous prime is 109620859. The next prime is 109620869. The reversal of 109620865 is 568026901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58798224 + 50822641 = 7668^2 + 7129^2 .

It is a cyclic number.

It is not a de Polignac number, because 109620865 - 2⁹ = 109620353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109620869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10962082 + ... + 10962091.

It is an arithmetic number, because the mean of its divisors is an integer number (32886261).

Almost surely, 2^109620865 is an apocalyptic number.

It is an amenable number.

109620865 is a deficient number, since it is larger than the sum of its proper divisors (21924179).

109620865 is an equidigital number, since it uses as much as digits as its factorization.

109620865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21924178.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 109620865 is about 10469.9983285577. The cubic root of 109620865 is about 478.5908687220.

The spelling of 109620865 in words is "one hundred nine million, six hundred twenty thousand, eight hundred sixty-five".