77304121 has 2 divisors, whose sum is σ = 77304122. Its totient is φ = 77304120.

The previous prime is 77304109. The next prime is 77304167. The reversal of 77304121 is 12140377.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77246521 + 57600 = 8789^2 + 240^2 .

It is a cyclic number.

It is not a de Polignac number, because 77304121 - 2¹¹ = 77302073 is a prime.

It is not a weakly prime, because it can be changed into another prime (77304181) 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, 38652060 + 38652061.

It is an arithmetic number, because the mean of its divisors is an integer number (38652061).

Almost surely, 2^77304121 is an apocalyptic number.

It is an amenable number.

77304121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77304121 is an equidigital number, since it uses as much as digits as its factorization.

77304121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 77304121 is about 8792.2762126767. The cubic root of 77304121 is about 425.9914495701.

Adding to 77304121 its reverse (12140377), we get a palindrome (89444498).

The spelling of 77304121 in words is "seventy-seven million, three hundred four thousand, one hundred twenty-one".