78982517 has 2 divisors, whose sum is σ = 78982518. Its totient is φ = 78982516.

The previous prime is 78982499. The next prime is 78982559. The reversal of 78982517 is 71528987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61999876 + 16982641 = 7874^2 + 4121^2 .

It is a cyclic number.

It is not a de Polignac number, because 78982517 - 2⁸ = 78982261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78982567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39491258 + 39491259.

It is an arithmetic number, because the mean of its divisors is an integer number (39491259).

Almost surely, 2^78982517 is an apocalyptic number.

It is an amenable number.

78982517 is a deficient number, since it is larger than the sum of its proper divisors (1).

78982517 is an equidigital number, since it uses as much as digits as its factorization.

78982517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The square root of 78982517 is about 8887.2108673081. The cubic root of 78982517 is about 429.0523877247.

The spelling of 78982517 in words is "seventy-eight million, nine hundred eighty-two thousand, five hundred seventeen".