108921781090 has 8 divisors (see below), whose sum is σ = 196059205980. Its totient is φ = 43568712432.

The previous prime is 108921781079. The next prime is 108921781091. The reversal of 108921781090 is 90187129801.

It is a Cunningham number, because it is equal to 330033²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 108921781089 + 1 = 330033^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 108921781090.

It is not an unprimeable number, because it can be changed into a prime (108921781091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5446089045 + ... + 5446089064.

Almost surely, 2^108921781090 is an apocalyptic number.

108921781090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

108921781090 is a deficient number, since it is larger than the sum of its proper divisors (87137424890).

108921781090 is a wasteful number, since it uses less digits than its factorization.

108921781090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10892178116.

The product of its (nonzero) digits is 72576, while the sum is 46.

The spelling of 108921781090 in words is "one hundred eight billion, nine hundred twenty-one million, seven hundred eighty-one thousand, ninety".