78115019 has 2 divisors, whose sum is σ = 78115020. Its totient is φ = 78115018.

The previous prime is 78115001. The next prime is 78115021. The reversal of 78115019 is 91051187.

It is a strong prime.

It is an emirp because it is prime and its reverse (91051187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78115019 - 2⁸ = 78114763 is a prime.

It is a super-2 number, since 2×78115019² = 12203912386740722, which contains 22 as substring.

Together with 78115021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78115039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39057509 + 39057510.

It is an arithmetic number, because the mean of its divisors is an integer number (39057510).

Almost surely, 2^78115019 is an apocalyptic number.

78115019 is a deficient number, since it is larger than the sum of its proper divisors (1).

78115019 is an equidigital number, since it uses as much as digits as its factorization.

78115019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 78115019 is about 8838.2701361748. The cubic root of 78115019 is about 427.4757808059.

The spelling of 78115019 in words is "seventy-eight million, one hundred fifteen thousand, nineteen".