78030109 has 2 divisors, whose sum is σ = 78030110. Its totient is φ = 78030108.

The previous prime is 78030103. The next prime is 78030133. The reversal of 78030109 is 90103087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72624484 + 5405625 = 8522^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 78030109 - 2³ = 78030101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78030101) 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 as a sum of consecutive naturals, namely, 39015054 + 39015055.

It is an arithmetic number, because the mean of its divisors is an integer number (39015055).

Almost surely, 2^78030109 is an apocalyptic number.

It is an amenable number.

78030109 is a deficient number, since it is larger than the sum of its proper divisors (1).

78030109 is an equidigital number, since it uses as much as digits as its factorization.

78030109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 78030109 is about 8833.4652883226. The cubic root of 78030109 is about 427.3208377984.

The spelling of 78030109 in words is "seventy-eight million, thirty thousand, one hundred nine".