78813523 has 2 divisors, whose sum is σ = 78813524. Its totient is φ = 78813522.

The previous prime is 78813517. The next prime is 78813551. The reversal of 78813523 is 32531887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78813523 - 2¹⁷ = 78682451 is a prime.

It is not a weakly prime, because it can be changed into another prime (78813583) 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, 39406761 + 39406762.

It is an arithmetic number, because the mean of its divisors is an integer number (39406762).

Almost surely, 2^78813523 is an apocalyptic number.

78813523 is a deficient number, since it is larger than the sum of its proper divisors (1).

78813523 is an equidigital number, since it uses as much as digits as its factorization.

78813523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 78813523 is about 8877.6980687563. The cubic root of 78813523 is about 428.7461636106.

The spelling of 78813523 in words is "seventy-eight million, eight hundred thirteen thousand, five hundred twenty-three".