78635201 has 2 divisors, whose sum is σ = 78635202. Its totient is φ = 78635200.

The previous prime is 78635191. The next prime is 78635209. The reversal of 78635201 is 10253687.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64384576 + 14250625 = 8024^2 + 3775^2 .

It is an emirp because it is prime and its reverse (10253687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78635201 - 2¹⁰ = 78634177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78635209) 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, 39317600 + 39317601.

It is an arithmetic number, because the mean of its divisors is an integer number (39317601).

Almost surely, 2^78635201 is an apocalyptic number.

It is an amenable number.

78635201 is a deficient number, since it is larger than the sum of its proper divisors (1).

78635201 is an equidigital number, since it uses as much as digits as its factorization.

78635201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 78635201 is about 8867.6491247681. The cubic root of 78635201 is about 428.4225617512.

Adding to 78635201 its reverse (10253687), we get a palindrome (88888888).

The spelling of 78635201 in words is "seventy-eight million, six hundred thirty-five thousand, two hundred one".