78351671 has 2 divisors, whose sum is σ = 78351672. Its totient is φ = 78351670.

The previous prime is 78351661. The next prime is 78351709. The reversal of 78351671 is 17615387.

It is an a-pointer prime, because the next prime (78351709) can be obtained adding 78351671 to its sum of digits (38).

It is a weak prime.

It is an emirp because it is prime and its reverse (17615387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78351671 - 2¹⁰ = 78350647 is a prime.

It is a super-2 number, since 2×78351671² = 12277968696984482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78351641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39175835 + 39175836.

It is an arithmetic number, because the mean of its divisors is an integer number (39175836).

Almost surely, 2^78351671 is an apocalyptic number.

78351671 is a deficient number, since it is larger than the sum of its proper divisors (1).

78351671 is an equidigital number, since it uses as much as digits as its factorization.

78351671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 38.

The square root of 78351671 is about 8851.6479256690. The cubic root of 78351671 is about 427.9070295487.

The spelling of 78351671 in words is "seventy-eight million, three hundred fifty-one thousand, six hundred seventy-one".