108990197 has 6 divisors (see below), whose sum is σ = 112016898. Its totient is φ = 106043184.

The previous prime is 108990187. The next prime is 108990209. The reversal of 108990197 is 791099801.

It can be written as a sum of positive squares in 3 ways, for example, as 22146436 + 86843761 = 4706^2 + 9319^2 .

It is not a de Polignac number, because 108990197 - 2¹⁰ = 108989173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108990157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38438 + ... + 41175.

It is an arithmetic number, because the mean of its divisors is an integer number (18669483).

Almost surely, 2^108990197 is an apocalyptic number.

It is an amenable number.

108990197 is a deficient number, since it is larger than the sum of its proper divisors (3026701).

108990197 is an frugal number, since it uses more digits than its factorization.

108990197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79687 (or 79650 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 108990197 is about 10439.8370198006. The cubic root of 108990197 is about 477.6712973313.

The spelling of 108990197 in words is "one hundred eight million, nine hundred ninety thousand, one hundred ninety-seven".