109898989 has 4 divisors (see below), whose sum is σ = 110044924. Its totient is φ = 109753056.

The previous prime is 109898981. The next prime is 109898993. The reversal of 109898989 is 989898901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989898901 = 4861 ⋅203641.

It can be written as a sum of positive squares in 2 ways, for example, as 97416900 + 12482089 = 9870^2 + 3533^2 .

It is a cyclic number.

It is not a de Polignac number, because 109898989 - 2³ = 109898981 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109898981) 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, 71832 + ... + 73345.

It is an arithmetic number, because the mean of its divisors is an integer number (27511231).

Almost surely, 2^109898989 is an apocalyptic number.

It is an amenable number.

109898989 is a deficient number, since it is larger than the sum of its proper divisors (145935).

109898989 is an equidigital number, since it uses as much as digits as its factorization.

109898989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145934.

The product of its (nonzero) digits is 3359232, while the sum is 61.

The square root of 109898989 is about 10483.2718652146. The cubic root of 109898989 is about 478.9952783329.

The spelling of 109898989 in words is "one hundred nine million, eight hundred ninety-eight thousand, nine hundred eighty-nine".