76656121 has 2 divisors, whose sum is σ = 76656122. Its totient is φ = 76656120.

The previous prime is 76656113. The next prime is 76656133. The reversal of 76656121 is 12165667.

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., 60140025 + 16516096 = 7755^2 + 4064^2 .

It is an emirp because it is prime and its reverse (12165667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76656121 - 2³ = 76656113 is a prime.

It is not a weakly prime, because it can be changed into another prime (76656721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38328060 + 38328061.

It is an arithmetic number, because the mean of its divisors is an integer number (38328061).

Almost surely, 2^76656121 is an apocalyptic number.

It is an amenable number.

76656121 is a deficient number, since it is larger than the sum of its proper divisors (1).

76656121 is an equidigital number, since it uses as much as digits as its factorization.

76656121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 76656121 is about 8755.3481369960. The cubic root of 76656121 is about 424.7978203286.

The spelling of 76656121 in words is "seventy-six million, six hundred fifty-six thousand, one hundred twenty-one".