77126321 has 2 divisors, whose sum is σ = 77126322. Its totient is φ = 77126320.

The previous prime is 77126311. The next prime is 77126333. The reversal of 77126321 is 12362177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41783296 + 35343025 = 6464^2 + 5945^2 .

It is an emirp because it is prime and its reverse (12362177) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77126321 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77126311) 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, 38563160 + 38563161.

It is an arithmetic number, because the mean of its divisors is an integer number (38563161).

Almost surely, 2^77126321 is an apocalyptic number.

It is an amenable number.

77126321 is a deficient number, since it is larger than the sum of its proper divisors (1).

77126321 is an equidigital number, since it uses as much as digits as its factorization.

77126321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 77126321 is about 8782.1592447416. The cubic root of 77126321 is about 425.6646044570.

Adding to 77126321 its reverse (12362177), we get a palindrome (89488498).

The spelling of 77126321 in words is "seventy-seven million, one hundred twenty-six thousand, three hundred twenty-one".