78319499 has 2 divisors, whose sum is σ = 78319500. Its totient is φ = 78319498.

The previous prime is 78319489. The next prime is 78319511. The reversal of 78319499 is 99491387.

It is a weak prime.

It is an emirp because it is prime and its reverse (99491387) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78319499 is a prime.

It is a super-2 number, since 2×78319499² = 12267887847222002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78319489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39159749 + 39159750.

It is an arithmetic number, because the mean of its divisors is an integer number (39159750).

Almost surely, 2^78319499 is an apocalyptic number.

78319499 is a deficient number, since it is larger than the sum of its proper divisors (1).

78319499 is an equidigital number, since it uses as much as digits as its factorization.

78319499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 78319499 is about 8849.8304503533. The cubic root of 78319499 is about 427.8484538585.

The spelling of 78319499 in words is "seventy-eight million, three hundred nineteen thousand, four hundred ninety-nine".