78325109 has 2 divisors, whose sum is σ = 78325110. Its totient is φ = 78325108.

The previous prime is 78325067. The next prime is 78325153. The reversal of 78325109 is 90152387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52852900 + 25472209 = 7270^2 + 5047^2 .

It is a cyclic number.

It is not a de Polignac number, because 78325109 - 2¹² = 78321013 is a prime.

It is a super-2 number, since 2×78325109² = 12269645399723762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78325609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39162554 + 39162555.

It is an arithmetic number, because the mean of its divisors is an integer number (39162555).

Almost surely, 2^78325109 is an apocalyptic number.

It is an amenable number.

78325109 is a deficient number, since it is larger than the sum of its proper divisors (1).

78325109 is an equidigital number, since it uses as much as digits as its factorization.

78325109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 78325109 is about 8850.1473999024. The cubic root of 78325109 is about 427.8586691627.

The spelling of 78325109 in words is "seventy-eight million, three hundred twenty-five thousand, one hundred nine".