77316121 has 2 divisors, whose sum is σ = 77316122. Its totient is φ = 77316120.

The previous prime is 77316101. The next prime is 77316143. The reversal of 77316121 is 12161377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63027721 + 14288400 = 7939^2 + 3780^2 .

It is a cyclic number.

It is not a de Polignac number, because 77316121 - 2¹³ = 77307929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77316121.

It is not a weakly prime, because it can be changed into another prime (77316101) 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, 38658060 + 38658061.

It is an arithmetic number, because the mean of its divisors is an integer number (38658061).

Almost surely, 2^77316121 is an apocalyptic number.

It is an amenable number.

77316121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77316121 is an equidigital number, since it uses as much as digits as its factorization.

77316121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 77316121 is about 8792.9586033371. The cubic root of 77316121 is about 426.0134907966.

Adding to 77316121 its reverse (12161377), we get a palindrome (89477498).

The spelling of 77316121 in words is "seventy-seven million, three hundred sixteen thousand, one hundred twenty-one".