78565051 has 2 divisors, whose sum is σ = 78565052. Its totient is φ = 78565050.

The previous prime is 78565021. The next prime is 78565073. The reversal of 78565051 is 15056587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78565051 - 2⁷ = 78564923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78565051.

It is not a weakly prime, because it can be changed into another prime (78565021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39282525 + 39282526.

It is an arithmetic number, because the mean of its divisors is an integer number (39282526).

Almost surely, 2^78565051 is an apocalyptic number.

78565051 is a deficient number, since it is larger than the sum of its proper divisors (1).

78565051 is an equidigital number, since it uses as much as digits as its factorization.

78565051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 37.

The square root of 78565051 is about 8863.6928534330. The cubic root of 78565051 is about 428.2951261003.

The spelling of 78565051 in words is "seventy-eight million, five hundred sixty-five thousand, fifty-one".