78813211 has 2 divisors, whose sum is σ = 78813212. Its totient is φ = 78813210.

The previous prime is 78813181. The next prime is 78813221. The reversal of 78813211 is 11231887.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (11231887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78813211 - 2¹¹ = 78811163 is a prime.

It is not a weakly prime, because it can be changed into another prime (78813221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39406605 + 39406606.

It is an arithmetic number, because the mean of its divisors is an integer number (39406606).

Almost surely, 2^78813211 is an apocalyptic number.

78813211 is a deficient number, since it is larger than the sum of its proper divisors (1).

78813211 is an equidigital number, since it uses as much as digits as its factorization.

78813211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 31.

The square root of 78813211 is about 8877.6804966162. The cubic root of 78813211 is about 428.7455978491.

The spelling of 78813211 in words is "seventy-eight million, eight hundred thirteen thousand, two hundred eleven".