109439989 has 2 divisors, whose sum is σ = 109439990. Its totient is φ = 109439988.

The previous prime is 109439977. The next prime is 109440041. The reversal of 109439989 is 989934901.

It is an a-pointer prime, because the next prime (109440041) can be obtained adding 109439989 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109369764 + 70225 = 10458^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 109439989 - 2¹¹ = 109437941 is a prime.

It is a super-2 number, since 2×109439989² = 23954222384640242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109439189) 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 as a sum of consecutive naturals, namely, 54719994 + 54719995.

It is an arithmetic number, because the mean of its divisors is an integer number (54719995).

Almost surely, 2^109439989 is an apocalyptic number.

It is an amenable number.

109439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

109439989 is an equidigital number, since it uses as much as digits as its factorization.

109439989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 109439989 is about 10461.3569387532. The cubic root of 109439989 is about 478.3274965463.

The spelling of 109439989 in words is "one hundred nine million, four hundred thirty-nine thousand, nine hundred eighty-nine".