104909989 has 2 divisors, whose sum is σ = 104909990. Its totient is φ = 104909988.

The previous prime is 104909971. The next prime is 104909999. The reversal of 104909989 is 989909401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103428900 + 1481089 = 10170^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 104909989 - 2⁵ = 104909957 is a prime.

It is a super-2 number, since 2×104909989² = 22012211583960242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104909999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52454994 + 52454995.

It is an arithmetic number, because the mean of its divisors is an integer number (52454995).

Almost surely, 2^104909989 is an apocalyptic number.

It is an amenable number.

104909989 is a deficient number, since it is larger than the sum of its proper divisors (1).

104909989 is an equidigital number, since it uses as much as digits as its factorization.

104909989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 104909989 is about 10242.5577372061. The cubic root of 104909989 is about 471.6345517610.

The spelling of 104909989 in words is "one hundred four million, nine hundred nine thousand, nine hundred eighty-nine".