78286291 has 2 divisors, whose sum is σ = 78286292. Its totient is φ = 78286290.

The previous prime is 78286279. The next prime is 78286303. The reversal of 78286291 is 19268287.

It is a balanced prime because it is at equal distance from previous prime (78286279) and next prime (78286303).

It is an emirp because it is prime and its reverse (19268287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78286291 - 2⁵ = 78286259 is a prime.

It is a super-2 number, since 2×78286291² = 12257486717073362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78286231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39143145 + 39143146.

It is an arithmetic number, because the mean of its divisors is an integer number (39143146).

Almost surely, 2^78286291 is an apocalyptic number.

78286291 is a deficient number, since it is larger than the sum of its proper divisors (1).

78286291 is an equidigital number, since it uses as much as digits as its factorization.

78286291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 78286291 is about 8847.9540572948. The cubic root of 78286291 is about 427.7879750922.

The spelling of 78286291 in words is "seventy-eight million, two hundred eighty-six thousand, two hundred ninety-one".