78248171 has 2 divisors, whose sum is σ = 78248172. Its totient is φ = 78248170.

The previous prime is 78248147. The next prime is 78248197. The reversal of 78248171 is 17184287.

It is a weak prime.

It is an emirp because it is prime and its reverse (17184287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78248171 - 2¹⁴ = 78231787 is a prime.

It is a super-2 number, since 2×78248171² = 12245552529690482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78248141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39124085 + 39124086.

It is an arithmetic number, because the mean of its divisors is an integer number (39124086).

Almost surely, 2^78248171 is an apocalyptic number.

78248171 is a deficient number, since it is larger than the sum of its proper divisors (1).

78248171 is an equidigital number, since it uses as much as digits as its factorization.

78248171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The square root of 78248171 is about 8845.7996246806. The cubic root of 78248171 is about 427.7185294504.

The spelling of 78248171 in words is "seventy-eight million, two hundred forty-eight thousand, one hundred seventy-one".