78164213 has 2 divisors, whose sum is σ = 78164214. Its totient is φ = 78164212.

The previous prime is 78164173. The next prime is 78164231. The reversal of 78164213 is 31246187.

Together with next prime (78164231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41899729 + 36264484 = 6473^2 + 6022^2 .

It is a cyclic number.

It is not a de Polignac number, because 78164213 - 2²⁶ = 11055349 is a prime.

It is a super-2 number, since 2×78164213² = 12219288387818738, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78164213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78164263) 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, 39082106 + 39082107.

It is an arithmetic number, because the mean of its divisors is an integer number (39082107).

Almost surely, 2^78164213 is an apocalyptic number.

It is an amenable number.

78164213 is a deficient number, since it is larger than the sum of its proper divisors (1).

78164213 is an equidigital number, since it uses as much as digits as its factorization.

78164213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 78164213 is about 8841.0527088125. The cubic root of 78164213 is about 427.5654982119.

The spelling of 78164213 in words is "seventy-eight million, one hundred sixty-four thousand, two hundred thirteen".