77683261 has 2 divisors, whose sum is σ = 77683262. Its totient is φ = 77683260.

The previous prime is 77683219. The next prime is 77683271. The reversal of 77683261 is 16238677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77528025 + 155236 = 8805^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 77683261 - 2¹¹ = 77681213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77683211) 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, 38841630 + 38841631.

It is an arithmetic number, because the mean of its divisors is an integer number (38841631).

Almost surely, 2^77683261 is an apocalyptic number.

It is an amenable number.

77683261 is a deficient number, since it is larger than the sum of its proper divisors (1).

77683261 is an equidigital number, since it uses as much as digits as its factorization.

77683261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 77683261 is about 8813.8108103136. The cubic root of 77683261 is about 426.6867426941.

The spelling of 77683261 in words is "seventy-seven million, six hundred eighty-three thousand, two hundred sixty-one".