78045971 has 2 divisors, whose sum is σ = 78045972. Its totient is φ = 78045970.

The previous prime is 78045959. The next prime is 78045973. The reversal of 78045971 is 17954087.

It is a strong prime.

It is an emirp because it is prime and its reverse (17954087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78045971 - 2²⁶ = 10937107 is a prime.

Together with 78045973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78045973) 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, 39022985 + 39022986.

It is an arithmetic number, because the mean of its divisors is an integer number (39022986).

Almost surely, 2^78045971 is an apocalyptic number.

78045971 is a deficient number, since it is larger than the sum of its proper divisors (1).

78045971 is an equidigital number, since it uses as much as digits as its factorization.

78045971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 78045971 is about 8834.3630783436. The cubic root of 78045971 is about 427.3497911685.

The spelling of 78045971 in words is "seventy-eight million, forty-five thousand, nine hundred seventy-one".