108789561 has 10 divisors (see below), whose sum is σ = 162512922. Its totient is φ = 72526320.

The previous prime is 108789559. The next prime is 108789581. The reversal of 108789561 is 165987801.

108789561 is a `hidden beast` number, since 1 + 0 + 8 + 7 + 89 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 100701225 + 8088336 = 10035^2 + 2844^2 .

It is not a de Polignac number, because 108789561 - 2¹ = 108789559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108789581) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 671460 + ... + 671621.

Almost surely, 2^108789561 is an apocalyptic number.

It is an amenable number.

108789561 is a deficient number, since it is larger than the sum of its proper divisors (53723361).

108789561 is an equidigital number, since it uses as much as digits as its factorization.

108789561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343093 (or 1343084 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 108789561 is about 10430.2234396009. The cubic root of 108789561 is about 477.3780081808.

The spelling of 108789561 in words is "one hundred eight million, seven hundred eighty-nine thousand, five hundred sixty-one".