77052121 has 2 divisors, whose sum is σ = 77052122. Its totient is φ = 77052120.

The previous prime is 77052119. The next prime is 77052133. The reversal of 77052121 is 12125077.

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., 50126400 + 26925721 = 7080^2 + 5189^2 .

It is a cyclic number.

It is not a de Polignac number, because 77052121 - 2¹ = 77052119 is a prime.

Together with 77052119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77052181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38526060 + 38526061.

It is an arithmetic number, because the mean of its divisors is an integer number (38526061).

Almost surely, 2^77052121 is an apocalyptic number.

It is an amenable number.

77052121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77052121 is an equidigital number, since it uses as much as digits as its factorization.

77052121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 77052121 is about 8777.9337545917. The cubic root of 77052121 is about 425.5280559683.

Adding to 77052121 its reverse (12125077), we get a palindrome (89177198).

The spelling of 77052121 in words is "seventy-seven million, fifty-two thousand, one hundred twenty-one".