77204081 has 2 divisors, whose sum is σ = 77204082. Its totient is φ = 77204080.

The previous prime is 77204041. The next prime is 77204137. The reversal of 77204081 is 18040277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71250481 + 5953600 = 8441^2 + 2440^2 .

It is an emirp because it is prime and its reverse (18040277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77204081 - 2¹⁸ = 76941937 is a prime.

It is a super-2 number, since 2×77204081² = 11920940246109122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77204041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38602040 + 38602041.

It is an arithmetic number, because the mean of its divisors is an integer number (38602041).

Almost surely, 2^77204081 is an apocalyptic number.

It is an amenable number.

77204081 is a deficient number, since it is larger than the sum of its proper divisors (1).

77204081 is an equidigital number, since it uses as much as digits as its factorization.

77204081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 77204081 is about 8786.5852866742. The cubic root of 77204081 is about 425.8076103792.

The spelling of 77204081 in words is "seventy-seven million, two hundred four thousand, eighty-one".