79680121 has 2 divisors, whose sum is σ = 79680122. Its totient is φ = 79680120.

The previous prime is 79680113. The next prime is 79680127. The reversal of 79680121 is 12108697.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77246521 + 2433600 = 8789^2 + 1560^2 .

It is a cyclic number.

It is not a de Polignac number, because 79680121 - 2³ = 79680113 is a prime.

It is not a weakly prime, because it can be changed into another prime (79680127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39840060 + 39840061.

It is an arithmetic number, because the mean of its divisors is an integer number (39840061).

Almost surely, 2^79680121 is an apocalyptic number.

It is an amenable number.

79680121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79680121 is an equidigital number, since it uses as much as digits as its factorization.

79680121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 79680121 is about 8926.3722194405. The cubic root of 79680121 is about 430.3118721810.

The spelling of 79680121 in words is "seventy-nine million, six hundred eighty thousand, one hundred twenty-one".