78463117 has 2 divisors, whose sum is σ = 78463118. Its totient is φ = 78463116.

The previous prime is 78463111. The next prime is 78463127. The reversal of 78463117 is 71136487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71419401 + 7043716 = 8451^2 + 2654^2 .

It is an emirp because it is prime and its reverse (71136487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78463117 - 2¹⁵ = 78430349 is a prime.

It is equal to p_4584934 and since 78463117 and 4584934 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 (78463111) 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, 39231558 + 39231559.

It is an arithmetic number, because the mean of its divisors is an integer number (39231559).

Almost surely, 2^78463117 is an apocalyptic number.

It is an amenable number.

78463117 is a deficient number, since it is larger than the sum of its proper divisors (1).

78463117 is an equidigital number, since it uses as much as digits as its factorization.

78463117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 78463117 is about 8857.9409006834. The cubic root of 78463117 is about 428.1098158395.

The spelling of 78463117 in words is "seventy-eight million, four hundred sixty-three thousand, one hundred seventeen".