78445951 has 2 divisors, whose sum is σ = 78445952. Its totient is φ = 78445950.

The previous prime is 78445931. The next prime is 78445981. The reversal of 78445951 is 15954487.

It is a weak prime.

It is an emirp because it is prime and its reverse (15954487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78445951 - 2⁵ = 78445919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78445898 and 78445907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78445921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39222975 + 39222976.

It is an arithmetic number, because the mean of its divisors is an integer number (39222976).

Almost surely, 2^78445951 is an apocalyptic number.

78445951 is a deficient number, since it is larger than the sum of its proper divisors (1).

78445951 is an equidigital number, since it uses as much as digits as its factorization.

78445951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 78445951 is about 8856.9718865987. The cubic root of 78445951 is about 428.0785932330.

The spelling of 78445951 in words is "seventy-eight million, four hundred forty-five thousand, nine hundred fifty-one".