78325517 has 2 divisors, whose sum is σ = 78325518. Its totient is φ = 78325516.

The previous prime is 78325483. The next prime is 78325519. The reversal of 78325517 is 71552387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73599241 + 4726276 = 8579^2 + 2174^2 .

It is a cyclic number.

It is not a de Polignac number, because 78325517 - 2¹⁶ = 78259981 is a prime.

It is a super-2 number, since 2×78325517² = 12269773226634578, which contains 22 as substring.

Together with 78325519, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78325519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39162758 + 39162759.

It is an arithmetic number, because the mean of its divisors is an integer number (39162759).

Almost surely, 2^78325517 is an apocalyptic number.

It is an amenable number.

78325517 is a deficient number, since it is larger than the sum of its proper divisors (1).

78325517 is an equidigital number, since it uses as much as digits as its factorization.

78325517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 38.

The square root of 78325517 is about 8850.1704503360. The cubic root of 78325517 is about 427.8594120749.

The spelling of 78325517 in words is "seventy-eight million, three hundred twenty-five thousand, five hundred seventeen".