108561977 has 4 divisors (see below), whose sum is σ = 108705396. Its totient is φ = 108418560.

The previous prime is 108561961. The next prime is 108562009. The reversal of 108561977 is 779165801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779165801 = 8753 ⋅89017.

It can be written as a sum of positive squares in 2 ways, for example, as 900601 + 107661376 = 949^2 + 10376^2 .

It is a cyclic number.

It is not a de Polignac number, because 108561977 - 2⁴ = 108561961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108563977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70568 + ... + 72089.

It is an arithmetic number, because the mean of its divisors is an integer number (27176349).

Almost surely, 2^108561977 is an apocalyptic number.

It is an amenable number.

108561977 is a deficient number, since it is larger than the sum of its proper divisors (143419).

108561977 is an equidigital number, since it uses as much as digits as its factorization.

108561977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143418.

The product of its (nonzero) digits is 105840, while the sum is 44.

The square root of 108561977 is about 10419.3078944813. The cubic root of 108561977 is about 477.0448896863.

The spelling of 108561977 in words is "one hundred eight million, five hundred sixty-one thousand, nine hundred seventy-seven".