78516259 has 2 divisors, whose sum is σ = 78516260. Its totient is φ = 78516258.

The previous prime is 78516247. The next prime is 78516281. The reversal of 78516259 is 95261587.

It is a weak prime.

It is an emirp because it is prime and its reverse (95261587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78516259 - 2⁹ = 78515747 is a prime.

It is equal to p_4587847 and since 78516259 and 4587847 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (78516209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39258129 + 39258130.

It is an arithmetic number, because the mean of its divisors is an integer number (39258130).

Almost surely, 2^78516259 is an apocalyptic number.

78516259 is a deficient number, since it is larger than the sum of its proper divisors (1).

78516259 is an equidigital number, since it uses as much as digits as its factorization.

78516259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 78516259 is about 8860.9400742811. The cubic root of 78516259 is about 428.2064450092.

The spelling of 78516259 in words is "seventy-eight million, five hundred sixteen thousand, two hundred fifty-nine".