78471859 has 2 divisors, whose sum is σ = 78471860. Its totient is φ = 78471858.

The previous prime is 78471851. The next prime is 78471863. The reversal of 78471859 is 95817487.

It is a strong prime.

It is an emirp because it is prime and its reverse (95817487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78471859 - 2³ = 78471851 is a prime.

It is not a weakly prime, because it can be changed into another prime (78471851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39235929 + 39235930.

It is an arithmetic number, because the mean of its divisors is an integer number (39235930).

Almost surely, 2^78471859 is an apocalyptic number.

78471859 is a deficient number, since it is larger than the sum of its proper divisors (1).

78471859 is an equidigital number, since it uses as much as digits as its factorization.

78471859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The square root of 78471859 is about 8858.4343424784. The cubic root of 78471859 is about 428.1257145920.

The spelling of 78471859 in words is "seventy-eight million, four hundred seventy-one thousand, eight hundred fifty-nine".