77468221 has 2 divisors, whose sum is σ = 77468222. Its totient is φ = 77468220.

The previous prime is 77468219. The next prime is 77468227. The reversal of 77468221 is 12286477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69139225 + 8328996 = 8315^2 + 2886^2 .

It is a cyclic number.

It is not a de Polignac number, because 77468221 - 2¹ = 77468219 is a prime.

Together with 77468219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77468227) 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, 38734110 + 38734111.

It is an arithmetic number, because the mean of its divisors is an integer number (38734111).

Almost surely, 2^77468221 is an apocalyptic number.

It is an amenable number.

77468221 is a deficient number, since it is larger than the sum of its proper divisors (1).

77468221 is an equidigital number, since it uses as much as digits as its factorization.

77468221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 37.

The square root of 77468221 is about 8801.6033198503. The cubic root of 77468221 is about 426.2926658988.

The spelling of 77468221 in words is "seventy-seven million, four hundred sixty-eight thousand, two hundred twenty-one".