78164311 has 2 divisors, whose sum is σ = 78164312. Its totient is φ = 78164310.

The previous prime is 78164297. The next prime is 78164369. The reversal of 78164311 is 11346187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78164311 - 2¹¹ = 78162263 is a prime.

It is a super-2 number, since 2×78164311² = 12219319028209442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78164381) 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, 39082155 + 39082156.

It is an arithmetic number, because the mean of its divisors is an integer number (39082156).

Almost surely, 2^78164311 is an apocalyptic number.

78164311 is a deficient number, since it is larger than the sum of its proper divisors (1).

78164311 is an equidigital number, since it uses as much as digits as its factorization.

78164311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 78164311 is about 8841.0582511371. The cubic root of 78164311 is about 427.5656769015.

The spelling of 78164311 in words is "seventy-eight million, one hundred sixty-four thousand, three hundred eleven".