78249959 has 2 divisors, whose sum is σ = 78249960. Its totient is φ = 78249958.

The previous prime is 78249947. The next prime is 78249967. The reversal of 78249959 is 95994287.

It is a strong prime.

It is an emirp because it is prime and its reverse (95994287) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78249959 is a prime.

It is a super-2 number, since 2×78249959² = 12246112167003362, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78249959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78249659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39124979 + 39124980.

It is an arithmetic number, because the mean of its divisors is an integer number (39124980).

Almost surely, 2^78249959 is an apocalyptic number.

78249959 is a deficient number, since it is larger than the sum of its proper divisors (1).

78249959 is an equidigital number, since it uses as much as digits as its factorization.

78249959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The square root of 78249959 is about 8845.9006890197. The cubic root of 78249959 is about 427.7217872684.

The spelling of 78249959 in words is "seventy-eight million, two hundred forty-nine thousand, nine hundred fifty-nine".