78454897 has 2 divisors, whose sum is σ = 78454898. Its totient is φ = 78454896.

The previous prime is 78454879. The next prime is 78454903. The reversal of 78454897 is 79845487.

Together with previous prime (78454879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53012961 + 25441936 = 7281^2 + 5044^2 .

It is an emirp because it is prime and its reverse (79845487) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78454897 is a prime.

It is not a weakly prime, because it can be changed into another prime (78454877) 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, 39227448 + 39227449.

It is an arithmetic number, because the mean of its divisors is an integer number (39227449).

Almost surely, 2^78454897 is an apocalyptic number.

It is an amenable number.

78454897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78454897 is an equidigital number, since it uses as much as digits as its factorization.

78454897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 52.

The square root of 78454897 is about 8857.4768980788. The cubic root of 78454897 is about 428.0948653519.

The spelling of 78454897 in words is "seventy-eight million, four hundred fifty-four thousand, eight hundred ninety-seven".