30998189 has 4 divisors (see below), whose sum is σ = 31042620. Its totient is φ = 30953760.

The previous prime is 30998179. The next prime is 30998197. The reversal of 30998189 is 98189903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98189903 = 7 ⋅14027129.

It can be written as a sum of positive squares in 2 ways, for example, as 12145225 + 18852964 = 3485^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 30998189 - 2⁸ = 30997933 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 (30998179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21152 + ... + 22569.

It is an arithmetic number, because the mean of its divisors is an integer number (7760655).

Almost surely, 2^30998189 is an apocalyptic number.

It is an amenable number.

30998189 is a deficient number, since it is larger than the sum of its proper divisors (44431).

30998189 is an equidigital number, since it uses as much as digits as its factorization.

30998189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44430.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 30998189 is about 5567.6017278537. The cubic root of 30998189 is about 314.1319478723.

The spelling of 30998189 in words is "thirty million, nine hundred ninety-eight thousand, one hundred eighty-nine".