108219997 has 4 divisors (see below), whose sum is σ = 108241596. Its totient is φ = 108198400.

The previous prime is 108219989. The next prime is 108220009. The reversal of 108219997 is 799912801.

It is a happy number.

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 31236921 + 76983076 = 5589^2 + 8774^2 .

It is a cyclic number.

It is not a de Polignac number, because 108219997 - 2³ = 108219989 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 (108219197) 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, 1053 + ... + 14749.

It is an arithmetic number, because the mean of its divisors is an integer number (27060399).

Almost surely, 2^108219997 is an apocalyptic number.

It is an amenable number.

108219997 is a deficient number, since it is larger than the sum of its proper divisors (21599).

108219997 is an equidigital number, since it uses as much as digits as its factorization.

108219997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21598.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 108219997 is about 10402.8840712564. The cubic root of 108219997 is about 476.5434513436.

The spelling of 108219997 in words is "one hundred eight million, two hundred nineteen thousand, nine hundred ninety-seven".