108998661 has 4 divisors (see below), whose sum is σ = 145331552. Its totient is φ = 72665772.

The previous prime is 108998647. The next prime is 108998677. The reversal of 108998661 is 166899801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166899801 = 3 ⋅55633267.

It is not a de Polignac number, because 108998661 - 2⁵ = 108998629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 108998661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108998621) 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, 18166441 + ... + 18166446.

It is an arithmetic number, because the mean of its divisors is an integer number (36332888).

Almost surely, 2^108998661 is an apocalyptic number.

It is an amenable number.

108998661 is a deficient number, since it is larger than the sum of its proper divisors (36332891).

108998661 is an equidigital number, since it uses as much as digits as its factorization.

108998661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36332890.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 108998661 is about 10440.2423822438. The cubic root of 108998661 is about 477.6836620678.

The spelling of 108998661 in words is "one hundred eight million, nine hundred ninety-eight thousand, six hundred sixty-one".