78525851 has 2 divisors, whose sum is σ = 78525852. Its totient is φ = 78525850.

The previous prime is 78525833. The next prime is 78525859. The reversal of 78525851 is 15852587.

It is a strong prime.

It is an emirp because it is prime and its reverse (15852587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78525851 - 2¹⁸ = 78263707 is a prime.

It is a Sophie Germain prime.

It is equal to p_4588367 and since 78525851 and 4588367 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 78525799 and 78525808.

It is not a weakly prime, because it can be changed into another prime (78525859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39262925 + 39262926.

It is an arithmetic number, because the mean of its divisors is an integer number (39262926).

Almost surely, 2^78525851 is an apocalyptic number.

78525851 is a deficient number, since it is larger than the sum of its proper divisors (1).

78525851 is an equidigital number, since it uses as much as digits as its factorization.

78525851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112000, while the sum is 41.

The square root of 78525851 is about 8861.4813095780. The cubic root of 78525851 is about 428.2238816906.

The spelling of 78525851 in words is "seventy-eight million, five hundred twenty-five thousand, eight hundred fifty-one".