77311823 has 2 divisors, whose sum is σ = 77311824. Its totient is φ = 77311822.

The previous prime is 77311777. The next prime is 77311837. The reversal of 77311823 is 32811377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77311823 - 2¹⁰ = 77310799 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77311823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77311873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38655911 + 38655912.

It is an arithmetic number, because the mean of its divisors is an integer number (38655912).

Almost surely, 2^77311823 is an apocalyptic number.

77311823 is a deficient number, since it is larger than the sum of its proper divisors (1).

77311823 is an equidigital number, since it uses as much as digits as its factorization.

77311823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 77311823 is about 8792.7141998361. The cubic root of 77311823 is about 426.0055966261.

The spelling of 77311823 in words is "seventy-seven million, three hundred eleven thousand, eight hundred twenty-three".