78530197 has 2 divisors, whose sum is σ = 78530198. Its totient is φ = 78530196.

The previous prime is 78530183. The next prime is 78530209. The reversal of 78530197 is 79103587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49434961 + 29095236 = 7031^2 + 5394^2 .

It is an emirp because it is prime and its reverse (79103587) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78530197 is a prime.

It is equal to p_4588618 and since 78530197 and 4588618 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78530107) 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, 39265098 + 39265099.

It is an arithmetic number, because the mean of its divisors is an integer number (39265099).

Almost surely, 2^78530197 is an apocalyptic number.

It is an amenable number.

78530197 is a deficient number, since it is larger than the sum of its proper divisors (1).

78530197 is an equidigital number, since it uses as much as digits as its factorization.

78530197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 78530197 is about 8861.7265247806. The cubic root of 78530197 is about 428.2317815377.

The spelling of 78530197 in words is "seventy-eight million, five hundred thirty thousand, one hundred ninety-seven".