78605311 has 2 divisors, whose sum is σ = 78605312. Its totient is φ = 78605310.

The previous prime is 78605309. The next prime is 78605321. The reversal of 78605311 is 11350687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78605311 - 2¹ = 78605309 is a prime.

Together with 78605309, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78605321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39302655 + 39302656.

It is an arithmetic number, because the mean of its divisors is an integer number (39302656).

Almost surely, 2^78605311 is an apocalyptic number.

78605311 is a deficient number, since it is larger than the sum of its proper divisors (1).

78605311 is an equidigital number, since it uses as much as digits as its factorization.

78605311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 78605311 is about 8865.9636250100. The cubic root of 78605311 is about 428.3682723530.

Adding to 78605311 its reverse (11350687), we get a palindrome (89955998).

The spelling of 78605311 in words is "seventy-eight million, six hundred five thousand, three hundred eleven".